GS1DigitalLinkToolkit.js

class GS1DigitalLinkToolkit {
	
	// constructor sets up various data resources shared by multiple methods
	constructor() {
		
		// list of all GS1 Application Identifiers as defined in GS1 General Specifications v18
		const aitable=[{"title":"Serial Shipping Container Code (SSCC) ","label":"SSCC","shortcode":"sscc","ai":"00","format":"N18","type":"I","fixedLength":true,"checkDigit":"L","regex":"(\\d{18})"},{"title":"Global Trade Item Number (GTIN)","label":"GTIN","shortcode":"gtin","ai":"01","format":"N14","type":"I","fixedLength":true,"checkDigit":"L","qualifiers":["22","10","21"],"regex":"(\\d{12,14}|\\d{8})"},{"title":"GTIN of contained trade items","label":"CONTENT","ai":"02","format":"N14","type":"D","fixedLength":true,"checkDigit":"L","regex":"(\\d{14})"},{"title":"Batch or lot number","label":"BATCH/LOT","shortcode":"lot","ai":"10","format":"X..20","type":"Q","fixedLength":false,"regex":"([\\x21-\\x22\\x25-\\x2F\\x30-\\x39\\x41-\\x5A\\x5F\\x61-\\x7A]{0,20})"},{"title":"Production date (YYMMDD)","label":"PROD DATE","ai":"11","format":"N6","type":"D","fixedLength":true,"regex":"(\\d{6})"},{"title":"Due date (YYMMDD)","label":"DUE DATE","ai":"12","format":"N6","type":"D","fixedLength":true,"regex":"(\\d{6})"},{"title":"Packaging date (YYMMDD)","label":"PACK DATE","ai":"13","format":"N6","type":"D","fixedLength":true,"regex":"(\\d{6})"},{"title":"Best before date (YYMMDD)","label":"BEST BEFORE or BEST BY","ai":"15","format":"N6","type":"D","fixedLength":true,"regex":"(\\d{6})"},{"title":"Sell by date (YYMMDD)","label":"SELL BY","ai":"16","format":"N6","type":"D","fixedLength":true,"regex":"(\\d{6})"},{"title":"Expiration date (YYMMDD)","label":"USE BY OR EXPIRY","shortcode":"exp","ai":"17","format":"N6","type":"D","fixedLength":true,"regex":"(\\d{6})"},{"title":"Internal product variant","label":"VARIANT","ai":"20","format":"N2","type":"D","fixedLength":true,"regex":"(\\d{2})"},{"title":"Serial number","label":"SERIAL","shortcode":"ser","ai":"21","format":"X..20","type":"Q","fixedLength":false,"regex":"([\\x21-\\x22\\x25-\\x2F\\x30-\\x39\\x41-\\x5A\\x5F\\x61-\\x7A]{0,20})"},{"title":"Consumer product variant","label":"CPV","shortcode":"cpv","ai":"22","format":"X..20","type":"Q","fixedLength":false,"regex":"([\\x21-\\x22\\x25-\\x2F\\x30-\\x39\\x41-\\x5A\\x5F\\x61-\\x7A]{0,20})"},{"title":"Additional product identification assigned by the manufacturer","label":"ADDITIONAL ID","ai":"240","format":"X..30","type":"D","fixedLength":false,"regex":"([\\x21-\\x22\\x25-\\x2F\\x30-\\x39\\x41-\\x5A\\x5F\\x61-\\x7A]{0,30})"},{"title":"Customer part number","label":"CUST. PART NO.","ai":"241","format":"X..30","type":"D","fixedLength":false,"regex":"([\\x21-\\x22\\x25-\\x2F\\x30-\\x39\\x41-\\x5A\\x5F\\x61-\\x7A]{0,30})"},{"title":"Made-to-Order variation number","label":"MTO VARIANT","ai":"242","format":"N..6","type":"D","fixedLength":false,"regex":"(\\d{0,6})"},{"title":"Packaging component number","label":"PCN","ai":"243","format":"X..20","type":"D","fixedLength":false,"regex":"([\\x21-\\x22\\x25-\\x2F\\x30-\\x39\\x41-\\x5A\\x5F\\x61-\\x7A]{0,20})"},{"title":"Secondary serial number","label":"SECONDARY SERIAL","ai":"250","format":"X..30","type":"D","fixedLength":false,"regex":"([\\x21-\\x22\\x25-\\x2F\\x30-\\x39\\x41-\\x5A\\x5F\\x61-\\x7A]{0,30})"},{"title":"Reference to source entity","label":"REF. TO SOURCE ","ai":"251","format":"X..30","type":"D","fixedLength":false,"regex":"([\\x21-\\x22\\x25-\\x2F\\x30-\\x39\\x41-\\x5A\\x5F\\x61-\\x7A]{0,30})"},{"title":"Global Document Type Identifier (GDTI)","label":"GDTI","shortcode":"gdti","ai":"253","format":"N13+X..17","type":"I","fixedLength":false,"checkDigit":"13","regex":"(\\d{13})([\\x21-\\x22\\x25-\\x2F\\x30-\\x39\\x41-\\x5A\\x5F\\x61-\\x7A]{0,17})"},{"title":"GLN extension component","label":"GLN EXTENSION COMPONENT","shortcode":"glnx","ai":"254","format":"X..20","type":"Q","fixedLength":false,"regex":"([\\x21-\\x22\\x25-\\x2F\\x30-\\x39\\x41-\\x5A\\x5F\\x61-\\x7A]{0,20})"},{"title":"Global Coupon Number (GCN)","label":"GCN","shortcode":"gcn","ai":"255","format":"N13+N..12","type":"I","fixedLength":false,"checkDigit":"13","regex":"(\\d{13})(\\d{0,12})"},{"title":"Variable count of items (variable measure trade item)","label":"VAR. COUNT","ai":"30","format":"N..8","type":"D","fixedLength":false,"regex":"(\\d{0,8})"},{"title":"Net weight, kilograms (variable measure trade item)","label":"NET WEIGHT (kg)","ai":"3100","format":"N6","type":"D","fixedLength":true,"regex":"(\\d{6})"},{"title":"Net weight, kilograms (variable measure trade item)","label":"NET WEIGHT (kg)","ai":"3101","format":"N6","type":"D","fixedLength":true,"regex":"(\\d{6})"},{"title":"Net weight, kilograms (variable measure trade item)","label":"NET WEIGHT (kg)","ai":"3102","format":"N6","type":"D","fixedLength":true,"regex":"(\\d{6})"},{"title":"Net weight, kilograms (variable measure trade item)","label":"NET WEIGHT (kg)","ai":"3103","format":"N6","type":"D","fixedLength":true,"regex":"(\\d{6})"},{"title":"Net weight, kilograms (variable measure trade item)","label":"NET WEIGHT (kg)","ai":"3104","format":"N6","type":"D","fixedLength":true,"regex":"(\\d{6})"},{"title":"Net weight, kilograms (variable measure trade item)","label":"NET WEIGHT (kg)","ai":"3105","format":"N6","type":"D","fixedLength":true,"regex":"(\\d{6})"},{"title":"Length or first dimension, metres (variable measure trade item)","label":"LENGTH (m)","ai":"3110","format":"N6","type":"D","fixedLength":true,"regex":"(\\d{6})"},{"title":"Length or first dimension, metres (variable measure trade item)","label":"LENGTH (m)","ai":"3111","format":"N6","type":"D","fixedLength":true,"regex":"(\\d{6})"},{"title":"Length or first dimension, metres (variable measure trade item)","label":"LENGTH (m)","ai":"3112","format":"N6","type":"D","fixedLength":true,"regex":"(\\d{6})"},{"title":"Length or first dimension, metres (variable measure trade item)","label":"LENGTH (m)","ai":"3113","format":"N6","type":"D","fixedLength":true,"regex":"(\\d{6})"},{"title":"Length or first dimension, metres (variable measure trade item)","label":"LENGTH (m)","ai":"3114","format":"N6","type":"D","fixedLength":true,"regex":"(\\d{6})"},{"title":"Length or first dimension, metres (variable measure trade item)","label":"LENGTH (m)","ai":"3115","format":"N6","type":"D","fixedLength":true,"regex":"(\\d{6})"},{"title":"Width, diameter, or second dimension, metres (variable measure trade item)","label":"WIDTH (m)","ai":"3120","format":"N6","type":"D","fixedLength":true,"regex":"(\\d{6})"},{"title":"Width, diameter, or second dimension, metres (variable measure trade item)","label":"WIDTH (m)","ai":"3121","format":"N6","type":"D","fixedLength":true,"regex":"(\\d{6})"},{"title":"Width, diameter, or second dimension, metres (variable measure trade item)","label":"WIDTH (m)","ai":"3122","format":"N6","type":"D","fixedLength":true,"regex":"(\\d{6})"},{"title":"Width, diameter, or second dimension, metres (variable measure trade item)","label":"WIDTH (m)","ai":"3123","format":"N6","type":"D","fixedLength":true,"regex":"(\\d{6})"},{"title":"Width, diameter, or second dimension, metres (variable measure trade item)","label":"WIDTH (m)","ai":"3124","format":"N6","type":"D","fixedLength":true,"regex":"(\\d{6})"},{"title":"Width, diameter, or second dimension, metres (variable measure trade item)","label":"WIDTH (m)","ai":"3125","format":"N6","type":"D","fixedLength":true,"regex":"(\\d{6})"},{"title":"Depth, thickness, height, or third dimension, metres (variable measure trade item)","label":"HEIGHT (m)","ai":"3130","format":"N6","type":"D","fixedLength":true,"regex":"(\\d{6})"},{"title":"Depth, thickness, height, or third dimension, metres (variable measure trade item)","label":"HEIGHT (m)","ai":"3131","format":"N6","type":"D","fixedLength":true,"regex":"(\\d{6})"},{"title":"Depth, thickness, height, or third dimension, metres (variable measure trade item)","label":"HEIGHT (m)","ai":"3132","format":"N6","type":"D","fixedLength":true,"regex":"(\\d{6})"},{"title":"Depth, thickness, height, or third dimension, metres (variable measure trade item)","label":"HEIGHT (m)","ai":"3133","format":"N6","type":"D","fixedLength":true,"regex":"(\\d{6})"},{"title":"Depth, thickness, height, or third dimension, metres (variable measure trade item)","label":"HEIGHT (m)","ai":"3134","format":"N6","type":"D","fixedLength":true,"regex":"(\\d{6})"},{"title":"Depth, thickness, height, or third dimension, metres (variable measure trade item)","label":"HEIGHT (m)","ai":"3135","format":"N6","type":"D","fixedLength":true,"regex":"(\\d{6})"},{"title":"Area, square metres (variable measure trade item)","label":"AREA (m^2)","ai":"3140","format":"N6","type":"D","fixedLength":true,"regex":"(\\d{6})"},{"title":"Area, square metres (variable measure trade item)","label":"AREA (m^2)","ai":"3141","format":"N6","type":"D","fixedLength":true,"regex":"(\\d{6})"},{"title":"Area, square metres (variable measure trade item)","label":"AREA (m^2)","ai":"3142","format":"N6","type":"D","fixedLength":true,"regex":"(\\d{6})"},{"title":"Area, square metres (variable measure trade item)","label":"AREA (m^2)","ai":"3143","format":"N6","type":"D","fixedLength":true,"regex":"(\\d{6})"},{"title":"Area, square metres (variable measure trade item)","label":"AREA (m^2)","ai":"3144","format":"N6","type":"D","fixedLength":true,"regex":"(\\d{6})"},{"title":"Area, square metres (variable measure trade item)","label":"AREA (m^2)","ai":"3145","format":"N6","type":"D","fixedLength":true,"regex":"(\\d{6})"},{"title":"Net volume, litres (variable measure trade item)","label":"NET VOLUME (l)","ai":"3150","format":"N6","type":"D","fixedLength":true,"regex":"(\\d{6})"},{"title":"Net volume, litres (variable measure trade item)","label":"NET VOLUME (l)","ai":"3151","format":"N6","type":"D","fixedLength":true,"regex":"(\\d{6})"},{"title":"Net volume, litres (variable measure trade item)","label":"NET VOLUME (l)","ai":"3152","format":"N6","type":"D","fixedLength":true,"regex":"(\\d{6})"},{"title":"Net volume, litres (variable measure trade item)","label":"NET VOLUME (l)","ai":"3153","format":"N6","type":"D","fixedLength":true,"regex":"(\\d{6})"},{"title":"Net volume, litres (variable measure trade item)","label":"NET VOLUME (l)","ai":"3154","format":"N6","type":"D","fixedLength":true,"regex":"(\\d{6})"},{"title":"Net volume, litres (variable measure trade item)","label":"NET VOLUME (l)","ai":"3155","format":"N6","type":"D","fixedLength":true,"regex":"(\\d{6})"},{"title":"Net volume, cubic metres (variable measure trade item)","label":"NET VOLUME (m^3)","ai":"3160","format":"N6","type":"D","fixedLength":true,"regex":"(\\d{6})"},{"title":"Net volume, cubic metres (variable measure trade item)","label":"NET VOLUME (m^3)","ai":"3161","format":"N6","type":"D","fixedLength":true,"regex":"(\\d{6})"},{"title":"Net volume, cubic metres (variable measure trade item)","label":"NET VOLUME (m^3)","ai":"3162","format":"N6","type":"D","fixedLength":true,"regex":"(\\d{6})"},{"title":"Net volume, cubic metres (variable measure trade item)","label":"NET VOLUME (m^3)","ai":"3163","format":"N6","type":"D","fixedLength":true,"regex":"(\\d{6})"},{"title":"Net volume, cubic metres (variable measure trade item)","label":"NET VOLUME (m^3)","ai":"3164","format":"N6","type":"D","fixedLength":true,"regex":"(\\d{6})"},{"title":"Net volume, cubic metres (variable measure trade item)","label":"NET VOLUME (m^3)","ai":"3165","format":"N6","type":"D","fixedLength":true,"regex":"(\\d{6})"},{"title":"Net weight, pounds (variable measure trade item)","label":"NET WEIGHT (lb)","ai":"3200","format":"N6","type":"D","fixedLength":true,"regex":"(\\d{6})"},{"title":"Net weight, pounds (variable measure trade item)","label":"NET WEIGHT (lb)","ai":"3201","format":"N6","type":"D","fixedLength":true,"regex":"(\\d{6})"},{"title":"Net weight, pounds (variable measure trade item)","label":"NET WEIGHT (lb)","ai":"3202","format":"N6","type":"D","fixedLength":true,"regex":"(\\d{6})"},{"title":"Net weight, pounds (variable measure trade item)","label":"NET WEIGHT (lb)","ai":"3203","format":"N6","type":"D","fixedLength":true,"regex":"(\\d{6})"},{"title":"Net weight, pounds (variable measure trade item)","label":"NET WEIGHT (lb)","ai":"3204","format":"N6","type":"D","fixedLength":true,"regex":"(\\d{6})"},{"title":"Net weight, pounds (variable measure trade item)","label":"NET WEIGHT (lb)","ai":"3205","format":"N6","type":"D","fixedLength":true,"regex":"(\\d{6})"},{"title":"Length or first dimension, inches (variable measure trade item)","label":"LENGTH (in)","ai":"3210","format":"N6","type":"D","fixedLength":true,"regex":"(\\d{6})"},{"title":"Length or first dimension, inches (variable measure trade item)","label":"LENGTH (in)","ai":"3211","format":"N6","type":"D","fixedLength":true,"regex":"(\\d{6})"},{"title":"Length or first dimension, inches (variable measure trade item)","label":"LENGTH (in)","ai":"3212","format":"N6","type":"D","fixedLength":true,"regex":"(\\d{6})"},{"title":"Length or first dimension, inches (variable measure trade item)","label":"LENGTH (in)","ai":"3213","format":"N6","type":"D","fixedLength":true,"regex":"(\\d{6})"},{"title":"Length or first dimension, inches (variable measure trade item)","label":"LENGTH (in)","ai":"3214","format":"N6","type":"D","fixedLength":true,"regex":"(\\d{6})"},{"title":"Length or first dimension, inches (variable measure trade item)","label":"LENGTH (in)","ai":"3215","format":"N6","type":"D","fixedLength":true,"regex":"(\\d{6})"},{"title":"Length or first dimension, feet (variable measure trade item)","label":"LENGTH (ft)","ai":"3220","format":"N6","type":"D","fixedLength":true,"regex":"(\\d{6})"},{"title":"Length or first dimension, feet (variable measure trade item)","label":"LENGTH (ft)","ai":"3221","format":"N6","type":"D","fixedLength":true,"regex":"(\\d{6})"},{"title":"Length or first dimension, feet (variable measure trade item)","label":"LENGTH (ft)","ai":"3222","format":"N6","type":"D","fixedLength":true,"regex":"(\\d{6})"},{"title":"Length or first dimension, feet (variable measure trade item)","label":"LENGTH (ft)","ai":"3223","format":"N6","type":"D","fixedLength":true,"regex":"(\\d{6})"},{"title":"Length or first dimension, feet (variable measure trade item)","label":"LENGTH (ft)","ai":"3224","format":"N6","type":"D","fixedLength":true,"regex":"(\\d{6})"},{"title":"Length or first dimension, feet (variable measure trade item)","label":"LENGTH (ft)","ai":"3225","format":"N6","type":"D","fixedLength":true,"regex":"(\\d{6})"},{"title":"Length or first dimension, yards (variable measure trade item)","label":"LENGTH (yd)","ai":"3230","format":"N6","type":"D","fixedLength":true,"regex":"(\\d{6})"},{"title":"Length or first dimension, yards (variable measure trade item)","label":"LENGTH (yd)","ai":"3231","format":"N6","type":"D","fixedLength":true,"regex":"(\\d{6})"},{"title":"Length or first dimension, yards (variable measure trade item)","label":"LENGTH (yd)","ai":"3232","format":"N6","type":"D","fixedLength":true,"regex":"(\\d{6})"},{"title":"Length or first dimension, yards (variable measure trade item)","label":"LENGTH (yd)","ai":"3233","format":"N6","type":"D","fixedLength":true,"regex":"(\\d{6})"},{"title":"Length or first dimension, yards (variable measure trade item)","label":"LENGTH (yd)","ai":"3234","format":"N6","type":"D","fixedLength":true,"regex":"(\\d{6})"},{"title":"Length or first dimension, yards (variable measure trade item)","label":"LENGTH (yd)","ai":"3235","format":"N6","type":"D","fixedLength":true,"regex":"(\\d{6})"},{"title":"Width, diameter, or second dimension, inches (variable measure trade item)","label":"WIDTH (in)","ai":"3240","format":"N6","type":"D","fixedLength":true,"regex":"(\\d{6})"},{"title":"Width, diameter, or second dimension, inches (variable measure trade item)","label":"WIDTH (in)","ai":"3241","format":"N6","type":"D","fixedLength":true,"regex":"(\\d{6})"},{"title":"Width, diameter, or second dimension, inches (variable measure trade item)","label":"WIDTH (in)","ai":"3242","format":"N6","type":"D","fixedLength":true,"regex":"(\\d{6})"},{"title":"Width, diameter, or second dimension, inches (variable measure trade item)","label":"WIDTH (in)","ai":"3243","format":"N6","type":"D","fixedLength":true,"regex":"(\\d{6})"},{"title":"Width, diameter, or second dimension, inches (variable measure trade item)","label":"WIDTH (in)","ai":"3244","format":"N6","type":"D","fixedLength":true,"regex":"(\\d{6})"},{"title":"Width, diameter, or second dimension, inches (variable measure trade item)","label":"WIDTH (in)","ai":"3245","format":"N6","type":"D","fixedLength":true,"regex":"(\\d{6})"},{"title":"Width, diameter, or second dimension, feet (variable measure trade item)","label":"WIDTH (ft)","ai":"3250","format":"N6","type":"D","fixedLength":true,"regex":"(\\d{6})"},{"title":"Width, diameter, or second dimension, feet (variable measure trade item)","label":"WIDTH (ft)","ai":"3251","format":"N6","type":"D","fixedLength":true,"regex":"(\\d{6})"},{"title":"Width, diameter, or second dimension, feet (variable measure trade item)","label":"WIDTH (ft)","ai":"3252","format":"N6","type":"D","fixedLength":true,"regex":"(\\d{6})"},{"title":"Width, diameter, or second dimension, feet (variable measure trade item)","label":"WIDTH (ft)","ai":"3253","format":"N6","type":"D","fixedLength":true,"regex":"(\\d{6})"},{"title":"Width, diameter, or second dimension, feet (variable measure trade item)","label":"WIDTH (ft)","ai":"3254","format":"N6","type":"D","fixedLength":true,"regex":"(\\d{6})"},{"title":"Width, diameter, or second dimension, feet (variable measure trade item)","label":"WIDTH (ft)","ai":"3255","format":"N6","type":"D","fixedLength":true,"regex":"(\\d{6})"},{"title":"Width, diameter, or second dimension, yards (variable measure trade item)","label":"WIDTH (yd)","ai":"3260","format":"N6","type":"D","fixedLength":true,"regex":"(\\d{6})"},{"title":"Width, diameter, or second dimension, yards (variable measure trade item)","label":"WIDTH (yd)","ai":"3261","format":"N6","type":"D","fixedLength":true,"regex":"(\\d{6})"},{"title":"Width, diameter, or second dimension, yards (variable measure trade item)","label":"WIDTH (yd)","ai":"3262","format":"N6","type":"D","fixedLength":true,"regex":"(\\d{6})"},{"title":"Width, diameter, or second dimension, yards (variable measure trade item)","label":"WIDTH (yd)","ai":"3263","format":"N6","type":"D","fixedLength":true,"regex":"(\\d{6})"},{"title":"Width, diameter, or second dimension, yards (variable measure trade item)","label":"WIDTH (yd)","ai":"3264","format":"N6","type":"D","fixedLength":true,"regex":"(\\d{6})"},{"title":"Width, diameter, or second dimension, yards (variable measure trade item)","label":"WIDTH (yd)","ai":"3265","format":"N6","type":"D","fixedLength":true,"regex":"(\\d{6})"},{"title":"Depth, thickness, height, or third dimension, inches (variable measure trade item)","label":"HEIGHT (in)","ai":"3270","format":"N6","type":"D","fixedLength":true,"regex":"(\\d{6})"},{"title":"Depth, thickness, height, or third dimension, inches (variable measure trade item)","label":"HEIGHT (in)","ai":"3271","format":"N6","type":"D","fixedLength":true,"regex":"(\\d{6})"},{"title":"Depth, thickness, height, or third dimension, inches (variable measure trade item)","label":"HEIGHT (in)","ai":"3272","format":"N6","type":"D","fixedLength":true,"regex":"(\\d{6})"},{"title":"Depth, thickness, height, or third dimension, inches (variable measure trade item)","label":"HEIGHT (in)","ai":"3273","format":"N6","type":"D","fixedLength":true,"regex":"(\\d{6})"},{"title":"Depth, thickness, height, or third dimension, inches (variable measure trade item)","label":"HEIGHT (in)","ai":"3274","format":"N6","type":"D","fixedLength":true,"regex":"(\\d{6})"},{"title":"Depth, thickness, height, or third dimension, inches (variable measure trade item)","label":"HEIGHT (in)","ai":"3275","format":"N6","type":"D","fixedLength":true,"regex":"(\\d{6})"},{"title":"Depth, thickness, height, or third dimension, feet (variable measure trade item)","label":"HEIGHT (ft)","ai":"3280","format":"N6","type":"D","fixedLength":true,"regex":"(\\d{6})"},{"title":"Depth, thickness, height, or third dimension, feet (variable measure trade item)","label":"HEIGHT (ft)","ai":"3281","format":"N6","type":"D","fixedLength":true,"regex":"(\\d{6})"},{"title":"Depth, thickness, height, or third dimension, feet (variable measure trade item)","label":"HEIGHT (ft)","ai":"3282","format":"N6","type":"D","fixedLength":true,"regex":"(\\d{6})"},{"title":"Depth, thickness, height, or third dimension, feet (variable measure trade item)","label":"HEIGHT (ft)","ai":"3283","format":"N6","type":"D","fixedLength":true,"regex":"(\\d{6})"},{"title":"Depth, thickness, height, or third dimension, feet (variable measure trade item)","label":"HEIGHT (ft)","ai":"3284","format":"N6","type":"D","fixedLength":true,"regex":"(\\d{6})"},{"title":"Depth, thickness, height, or third dimension, feet (variable measure trade item)","label":"HEIGHT (ft)","ai":"3285","format":"N6","type":"D","fixedLength":true,"regex":"(\\d{6})"},{"title":"Depth, thickness, height, or third dimension, yards (variable measure trade item)","label":"HEIGHT (yd)","ai":"3290","format":"N6","type":"D","fixedLength":true,"regex":"(\\d{6})"},{"title":"Depth, thickness, height, or third dimension, yards (variable measure trade item)","label":"HEIGHT (yd)","ai":"3291","format":"N6","type":"D","fixedLength":true,"regex":"(\\d{6})"},{"title":"Depth, thickness, height, or third dimension, yards (variable measure trade item)","label":"HEIGHT (yd)","ai":"3292","format":"N6","type":"D","fixedLength":true,"regex":"(\\d{6})"},{"title":"Depth, thickness, height, or third dimension, yards (variable measure trade item)","label":"HEIGHT (yd)","ai":"3293","format":"N6","type":"D","fixedLength":true,"regex":"(\\d{6})"},{"title":"Depth, thickness, height, or third dimension, yards (variable measure trade item)","label":"HEIGHT (yd)","ai":"3294","format":"N6","type":"D","fixedLength":true,"regex":"(\\d{6})"},{"title":"Depth, thickness, height, or third dimension, yards (variable measure trade item)","label":"HEIGHT (yd)","ai":"3295","format":"N6","type":"D","fixedLength":true,"regex":"(\\d{6})"},{"title":"Logistic weight, kilograms","label":"GROSS WEIGHT (kg)","ai":"3300","format":"N6","type":"D","fixedLength":true,"regex":"(\\d{6})"},{"title":"Logistic weight, kilograms","label":"GROSS WEIGHT (kg)","ai":"3301","format":"N6","type":"D","fixedLength":true,"regex":"(\\d{6})"},{"title":"Logistic weight, kilograms","label":"GROSS WEIGHT (kg)","ai":"3302","format":"N6","type":"D","fixedLength":true,"regex":"(\\d{6})"},{"title":"Logistic weight, kilograms","label":"GROSS WEIGHT (kg)","ai":"3303","format":"N6","type":"D","fixedLength":true,"regex":"(\\d{6})"},{"title":"Logistic weight, kilograms","label":"GROSS WEIGHT (kg)","ai":"3304","format":"N6","type":"D","fixedLength":true,"regex":"(\\d{6})"},{"title":"Logistic weight, kilograms","label":"GROSS WEIGHT (kg)","ai":"3305","format":"N6","type":"D","fixedLength":true,"regex":"(\\d{6})"},{"title":"Length or first dimension, metres","label":"LENGTH (m), log","ai":"3310","format":"N6","type":"D","fixedLength":true,"regex":"(\\d{6})"},{"title":"Length or first dimension, metres","label":"LENGTH (m), log","ai":"3311","format":"N6","type":"D","fixedLength":true,"regex":"(\\d{6})"},{"title":"Length or first dimension, metres","label":"LENGTH (m), log","ai":"3312","format":"N6","type":"D","fixedLength":true,"regex":"(\\d{6})"},{"title":"Length or first dimension, metres","label":"LENGTH (m), log","ai":"3313","format":"N6","type":"D","fixedLength":true,"regex":"(\\d{6})"},{"title":"Length or first dimension, metres","label":"LENGTH (m), log","ai":"3314","format":"N6","type":"D","fixedLength":true,"regex":"(\\d{6})"},{"title":"Length or first dimension, metres","label":"LENGTH (m), log","ai":"3315","format":"N6","type":"D","fixedLength":true,"regex":"(\\d{6})"},{"title":"Width, diameter, or second dimension, metres","label":"WIDTH (m), log","ai":"3320","format":"N6","type":"D","fixedLength":true,"regex":"(\\d{6})"},{"title":"Width, diameter, or second dimension, metres","label":"WIDTH (m), log","ai":"3321","format":"N6","type":"D","fixedLength":true,"regex":"(\\d{6})"},{"title":"Width, diameter, or second dimension, metres","label":"WIDTH (m), log","ai":"3322","format":"N6","type":"D","fixedLength":true,"regex":"(\\d{6})"},{"title":"Width, diameter, or second dimension, metres","label":"WIDTH (m), 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0","ai":"7030","format":"X..27","type":"D","fixedLength":false,"regex":"(\\d{3})([\\x21-\\x22\\x25-\\x2F\\x30-\\x39\\x41-\\x5A\\x5F\\x61-\\x7A]{0,27})"},{"title":"Number of processor with ISO Country Code","label":"PROCESSOR # 1","ai":"7031","format":"X..27","type":"D","fixedLength":false,"regex":"(\\d{3})([\\x21-\\x22\\x25-\\x2F\\x30-\\x39\\x41-\\x5A\\x5F\\x61-\\x7A]{0,27})"},{"title":"Number of processor with ISO Country Code","label":"PROCESSOR # 2","ai":"7032","format":"X..27","type":"D","fixedLength":false,"regex":"(\\d{3})([\\x21-\\x22\\x25-\\x2F\\x30-\\x39\\x41-\\x5A\\x5F\\x61-\\x7A]{0,27})"},{"title":"Number of processor with ISO Country Code","label":"PROCESSOR # 3","ai":"7033","format":"X..27","type":"D","fixedLength":false,"regex":"(\\d{3})([\\x21-\\x22\\x25-\\x2F\\x30-\\x39\\x41-\\x5A\\x5F\\x61-\\x7A]{0,27})"},{"title":"Number of processor with ISO Country Code","label":"PROCESSOR # 4","ai":"7034","format":"X..27","type":"D","fixedLength":false,"regex":"(\\d{3})([\\x21-\\x22\\x25-\\x2F\\x30-\\x39\\x41-\\x5A\\x5F\\x61-\\x7A]{0,27})"},{"title":"Number of processor with ISO Country Code","label":"PROCESSOR # 5","ai":"7035","format":"X..27","type":"D","fixedLength":false,"regex":"(\\d{3})([\\x21-\\x22\\x25-\\x2F\\x30-\\x39\\x41-\\x5A\\x5F\\x61-\\x7A]{0,27})"},{"title":"Number of processor with ISO Country Code","label":"PROCESSOR # 6","ai":"7036","format":"X..27","type":"D","fixedLength":false,"regex":"(\\d{3})([\\x21-\\x22\\x25-\\x2F\\x30-\\x39\\x41-\\x5A\\x5F\\x61-\\x7A]{0,27})"},{"title":"Number of processor with ISO Country Code","label":"PROCESSOR # 7","ai":"7037","format":"X..27","type":"D","fixedLength":false,"regex":"(\\d{3})([\\x21-\\x22\\x25-\\x2F\\x30-\\x39\\x41-\\x5A\\x5F\\x61-\\x7A]{0,27})"},{"title":"Number of processor with ISO Country Code","label":"PROCESSOR # 8","ai":"7038","format":"X..27","type":"D","fixedLength":false,"regex":"(\\d{3})([\\x21-\\x22\\x25-\\x2F\\x30-\\x39\\x41-\\x5A\\x5F\\x61-\\x7A]{0,27})"},{"title":"Number of processor with ISO Country Code","label":"PROCESSOR # 9","ai":"7039","format":"X..27","type":"D","fixedLength":false,"regex":"(\\d{3})([\\x21-\\x22\\x25-\\x2F\\x30-\\x39\\x41-\\x5A\\x5F\\x61-\\x7A]{0,27})"},{"title":"National Healthcare Reimbursement Number (NHRN) - Germany PZN","label":"NHRN PZN","ai":"710","format":"X..20","type":"D","fixedLength":false,"regex":"([\\x21-\\x22\\x25-\\x2F\\x30-\\x39\\x41-\\x5A\\x5F\\x61-\\x7A]{0,20})"},{"title":"National Healthcare Reimbursement Number (NHRN) - France CIP","label":"NHRN CIP","ai":"711","format":"X..20","type":"D","fixedLength":false,"regex":"([\\x21-\\x22\\x25-\\x2F\\x30-\\x39\\x41-\\x5A\\x5F\\x61-\\x7A]{0,20})"},{"title":"National Healthcare Reimbursement Number (NHRN) - Spain CN","label":"NHRN CN","ai":"712","format":"X..20","type":"D","fixedLength":false,"regex":"([\\x21-\\x22\\x25-\\x2F\\x30-\\x39\\x41-\\x5A\\x5F\\x61-\\x7A]{0,20})"},{"title":"National Healthcare Reimbursement Number (NHRN) - Brasil DRN","label":"NHRN DRN","ai":"713","format":"X..20","type":"D","fixedLength":false,"regex":"([\\x21-\\x22\\x25-\\x2F\\x30-\\x39\\x41-\\x5A\\x5F\\x61-\\x7A]{0,20})"},{"title":"National Healthcare Reimbursement Number (NHRN) - Portugal AIM","label":"NHRN AIM","ai":"714","format":"X..20","type":"D","fixedLength":false,"regex":"([\\x21-\\x22\\x25-\\x2F\\x30-\\x39\\x41-\\x5A\\x5F\\x61-\\x7A]{0,20})"},{"title":"Certification reference # 0","label":"CERT # 0","ai":"7230","format":"X2+X..28","type":"D","fixedLength":false,"regex":"([\\x21-\\x22\\x25-\\x2F\\x30-\\x39\\x41-\\x5A\\x5F\\x61-\\x7A]{2,30})"},{"title":"Certification reference # 1","label":"CERT # 1","ai":"7231","format":"X2+X..28","type":"D","fixedLength":false,"regex":"([\\x21-\\x22\\x25-\\x2F\\x30-\\x39\\x41-\\x5A\\x5F\\x61-\\x7A]{2,30})"},{"title":"Certification reference # 2","label":"CERT # 2","ai":"7232","format":"X2+X..28","type":"D","fixedLength":false,"regex":"([\\x21-\\x22\\x25-\\x2F\\x30-\\x39\\x41-\\x5A\\x5F\\x61-\\x7A]{2,30})"},{"title":"Certification reference # 3","label":"CERT # 3","ai":"7233","format":"X2+X..28","type":"D","fixedLength":false,"regex":"([\\x21-\\x22\\x25-\\x2F\\x30-\\x39\\x41-\\x5A\\x5F\\x61-\\x7A]{2,30})"},{"title":"Certification reference # 4","label":"CERT # 4","ai":"7234","format":"X2+X..28","type":"D","fixedLength":false,"regex":"([\\x21-\\x22\\x25-\\x2F\\x30-\\x39\\x41-\\x5A\\x5F\\x61-\\x7A]{2,30})"},{"title":"Certification reference # 5","label":"CERT # 5","ai":"7235","format":"X2+X..28","type":"D","fixedLength":false,"regex":"([\\x21-\\x22\\x25-\\x2F\\x30-\\x39\\x41-\\x5A\\x5F\\x61-\\x7A]{2,30})"},{"title":"Certification reference # 6","label":"CERT # 6","ai":"7236","format":"X2+X..28","type":"D","fixedLength":false,"regex":"([\\x21-\\x22\\x25-\\x2F\\x30-\\x39\\x41-\\x5A\\x5F\\x61-\\x7A]{2,30})"},{"title":"Certification reference # 7","label":"CERT # 7","ai":"7237","format":"X2+X..28","type":"D","fixedLength":false,"regex":"([\\x21-\\x22\\x25-\\x2F\\x30-\\x39\\x41-\\x5A\\x5F\\x61-\\x7A]{2,30})"},{"title":"Certification reference # 8","label":"CERT # 8","ai":"7238","format":"X2+X..28","type":"D","fixedLength":false,"regex":"([\\x21-\\x22\\x25-\\x2F\\x30-\\x39\\x41-\\x5A\\x5F\\x61-\\x7A]{2,30})"},{"title":"Certification reference # 9","label":"CERT # 9","ai":"7239","format":"X2+X..28","type":"D","fixedLength":false,"regex":"([\\x21-\\x22\\x25-\\x2F\\x30-\\x39\\x41-\\x5A\\x5F\\x61-\\x7A]{2,30})"},{"title":"Roll products (width, length, core diameter, direction, splices)","label":"DIMENSIONS","ai":"8001","format":"N14","type":"D","fixedLength":true,"regex":"(\\d{14})"},{"title":"Cellular mobile telephone identifier","label":"CMT No","ai":"8002","format":"X..20","type":"D","fixedLength":false,"regex":"([\\x21-\\x22\\x25-\\x2F\\x30-\\x39\\x41-\\x5A\\x5F\\x61-\\x7A]{0,20})"},{"title":"Global Returnable Asset Identifier (GRAI)","label":"GRAI","shortcode":"grai","ai":"8003","format":"N14+X..16","type":"I","fixedLength":false,"checkDigit":"13","regex":"(\\d{14})([\\x21-\\x22\\x25-\\x2F\\x30-\\x39\\x41-\\x5A\\x5F\\x61-\\x7A]{0,16})"},{"title":"Global Individual Asset Identifier (GIAI)","label":"GIAI","shortcode":"giai","ai":"8004","format":"X..30","type":"I","fixedLength":false,"regex":"([\\x21-\\x22\\x25-\\x2F\\x30-\\x39\\x41-\\x5A\\x5F\\x61-\\x7A]{0,30})"},{"title":"Price per unit of measure","label":"PRICE PER UNIT","ai":"8005","format":"N6","type":"D","fixedLength":true,"regex":"(\\d{6})"},{"title":"Identification of an individual trade item piece","label":"ITIP","shortcode":"itip","ai":"8006","format":"N14+N2+N2","type":"I","fixedLength":true,"checkDigit":"14","qualifiers":["22","10","21"],"regex":"(\\d{14})(\\d{2})(\\d{2})"},{"title":"International Bank Account Number (IBAN) ","label":"IBAN","ai":"8007","format":"X..34","type":"D","fixedLength":false,"regex":"([\\x21-\\x22\\x25-\\x2F\\x30-\\x39\\x41-\\x5A\\x5F\\x61-\\x7A]{0,34})"},{"title":"Date and time of production","label":"PROD TIME","ai":"8008","format":"N8+N..4","type":"D","fixedLength":false,"regex":"(\\d{8})(\\d{0,4})"},{"title":"Optically Readable Sensor Indicator","label":"OPT SEN","ai":"8009","format":"X..50","type":"D","fixedLength":false,"regex":"([\\x21-\\x22\\x25-\\x2F\\x30-\\x39\\x41-\\x5A\\x5F\\x61-\\x7A]{0,50})"},{"title":"Component/Part Identifier (CPID)","label":"CPID","shortcode":"cpid","ai":"8010","format":"Y..30","type":"I","fixedLength":false,"qualifiers":["8011"],"regex":"([\\x23\\x2D\\x2F\\x30-\\x39\\x41-\\x5A]{0,30})"},{"title":"Component/Part Identifier serial number (CPID SERIAL)","label":"CPID SERIAL","shortcode":"cpsn","ai":"8011","format":"N..12","type":"Q","fixedLength":false,"regex":"(\\d{0,12})"},{"title":"Software version","label":"VERSION","ai":"8012","format":"X..20","type":"D","fixedLength":false,"regex":"([\\x21-\\x22\\x25-\\x2F\\x30-\\x39\\x41-\\x5A\\x5F\\x61-\\x7A]{0,20})"},{"title":"Global Model Number (GMN)","label":"GMN (for medical devices, the default, global data title is BUDI-DI )","ai":"8013","format":"X..30","type":"D","fixedLength":false,"regex":"([\\x21-\\x22\\x25-\\x2F\\x30-\\x39\\x41-\\x5A\\x5F\\x61-\\x7A]{0,30})"},{"title":"Global Service Relation Number - Provider","label":"GSRN - PROVIDER","shortcode":"gsrnp","ai":"8017","format":"N18","type":"I","fixedLength":true,"checkDigit":"L","qualifiers":["8019"],"regex":"(\\d{18})"},{"title":"Global Service Relation Number - Recipient","label":"GSRN - RECIPIENT","shortcode":"gsrn","ai":"8018","format":"N18","type":"I","fixedLength":true,"checkDigit":"L","qualifiers":["8019"],"regex":"(\\d{18})"},{"title":"Service Relation Instance Number (SRIN)","label":"SRIN","shortcode":"srin","ai":"8019","format":"N..10","type":"Q","fixedLength":false,"regex":"(\\d{0,10})"},{"title":"Payment slip reference number","label":"REF No","ai":"8020","format":"X..25","type":"D","fixedLength":false,"regex":"([\\x21-\\x22\\x25-\\x2F\\x30-\\x39\\x41-\\x5A\\x5F\\x61-\\x7A]{0,25})"},{"title":"Identification of pieces of a trade item contained in a logistics unit","label":"ITIP CONTENT","ai":"8026","format":"N14+N2+N2","type":"D","fixedLength":true,"checkDigit":"14","regex":"(\\d{14})(\\d{2})(\\d{2})"},{"title":"Coupon code identification for use in North America","ai":"8110","format":"X..70","type":"D","fixedLength":false,"regex":"([\\x21-\\x22\\x25-\\x2F\\x30-\\x39\\x41-\\x5A\\x5F\\x61-\\x7A]{0,70})"},{"title":"Loyalty points of a coupon","label":"POINTS","ai":"8111","format":"N4","type":"D","fixedLength":true,"regex":"(\\d{4})"},{"title":"Paperless coupon code identification for use in North America","ai":"8112","format":"X..70","type":"D","fixedLength":false,"regex":"([\\x21-\\x22\\x25-\\x2F\\x30-\\x39\\x41-\\x5A\\x5F\\x61-\\x7A]{0,70})"},{"title":"Extended Packaging URL ","label":"PRODUCT URL","ai":"8200","format":"X..70","type":"D","fixedLength":false,"regex":"([\\x21-\\x22\\x25-\\x2F\\x30-\\x39\\x41-\\x5A\\x5F\\x61-\\x7A]{0,70})"},{"title":"Information mutually agreed between trading partners","label":"INTERNAL","ai":"90","format":"X..30","type":"D","fixedLength":false,"regex":"([\\x21-\\x22\\x25-\\x2F\\x30-\\x39\\x41-\\x5A\\x5F\\x61-\\x7A]{0,30})"},{"title":"Company internal information","label":"INTERNAL","ai":"91","format":"X..90","type":"D","fixedLength":false,"regex":"([\\x21-\\x22\\x25-\\x2F\\x30-\\x39\\x41-\\x5A\\x5F\\x61-\\x7A]{0,90})"},{"title":"Company internal information","label":"INTERNAL","ai":"92","format":"X..90","type":"D","fixedLength":false,"regex":"([\\x21-\\x22\\x25-\\x2F\\x30-\\x39\\x41-\\x5A\\x5F\\x61-\\x7A]{0,90})"},{"title":"Company internal information","label":"INTERNAL","ai":"93","format":"X..90","type":"D","fixedLength":false,"regex":"([\\x21-\\x22\\x25-\\x2F\\x30-\\x39\\x41-\\x5A\\x5F\\x61-\\x7A]{0,90})"},{"title":"Company internal information","label":"INTERNAL","ai":"94","format":"X..90","type":"D","fixedLength":false,"regex":"([\\x21-\\x22\\x25-\\x2F\\x30-\\x39\\x41-\\x5A\\x5F\\x61-\\x7A]{0,90})"},{"title":"Company internal information","label":"INTERNAL","ai":"95","format":"X..90","type":"D","fixedLength":false,"regex":"([\\x21-\\x22\\x25-\\x2F\\x30-\\x39\\x41-\\x5A\\x5F\\x61-\\x7A]{0,90})"},{"title":"Company internal information","label":"INTERNAL","ai":"96","format":"X..90","type":"D","fixedLength":false,"regex":"([\\x21-\\x22\\x25-\\x2F\\x30-\\x39\\x41-\\x5A\\x5F\\x61-\\x7A]{0,90})"},{"title":"Company internal information","label":"INTERNAL","ai":"97","format":"X..90","type":"D","fixedLength":false,"regex":"([\\x21-\\x22\\x25-\\x2F\\x30-\\x39\\x41-\\x5A\\x5F\\x61-\\x7A]{0,90})"},{"title":"Company internal information","label":"INTERNAL","ai":"98","format":"X..90","type":"D","fixedLength":false,"regex":"([\\x21-\\x22\\x25-\\x2F\\x30-\\x39\\x41-\\x5A\\x5F\\x61-\\x7A]{0,90})"},{"title":"Company internal information","label":"INTERNAL","ai":"99","format":"X..90","type":"D","fixedLength":false,"regex":"([\\x21-\\x22\\x25-\\x2F\\x30-\\x39\\x41-\\x5A\\x5F\\x61-\\x7A]{0,90})"}];

		// Element Strings with predefined length using GS1 Application Identifiers, as defined in GS1 Gen Specs - see Figure 7.8.4-2 of GS1 Gen Specs v18 at https://www.gs1.org/docs/barcodes/GS1_General_Specifications.pdf
		const fixedLengthTable={"00":20,"01":16,"02":16,"03":16,"04":18,"11":8,"12":8,"13":8,"14":8,"15":8,"16":8,"17":8,"18":8,"19":4,"20":4,"31":10,"32":10,"33":10,"34":10,"35":10,"36":10,"41":16};

		// tableP indicates for any initial two digits, what is the total length of the numeric AI key, e.g. "80":4 --> all AI keys beginning with 80 are four digit AI keys, 80xx
		const tableP = {"00":2,"01":2,"02":2,"10":2,"11":2,"12":2,"13":2,"15":2,"16":2,"17":2,"20":2,"21":2,"22":2,"23":3,"24":3,"25":3,"30":2,"31":4,"32":4,"33":4,"34":4,"35":4,"36":4,"37":2,"39":4,"40":3,"41":3,"42":3,"70":4,"71":3,"72":4,"80":4,"81":4,"82":4,"90":2,"91":2,"92":2,"93":2,"94":2,"95":2,"96":2,"97":2,"98":2,"99":2};

		// tableF indicates the expected format for the value of each AI.  
		
		const 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		// safeBase64Alphabet is a modified URI-safe Base64 alphabet used in the compression methods for converting the binary string to/from an alphanumeric representation that contains no characters that are restricted in URIs
		const safeBase64Alphabet="ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789-_";

		const hexAlphabet="0123456789ABCDEF";

		const regexAllNum=new RegExp("^[0-9]+$");
		const regexHexLower=new RegExp("^[0-9a-f]+$");
		const regexHexUpper=new RegExp("^[0-9A-F]+$");
		const regexSafe64=new RegExp("^[A-Za-z0-9_-]+$");

		const tableOptReverse={};
		let tableOptKeys = Object.keys(tableOpt);
		for (let i in tableOptKeys) {
			tableOptReverse[JSON.stringify(tableOpt[tableOptKeys[i]].sort())]=tableOptKeys[i];
		}

		const aiRegex={};
		const aiShortCode={};
		const aiQualifiers={};
		const aiCheckDigitPosition={};

		for (let a in aitable) {
			if (aitable[a] !== undefined) {
		
				aiRegex[aitable[a].ai] = new RegExp("^"+aitable[a].regex+"$");

				if (aitable[a].shortcode !== undefined) {
				aiShortCode[aitable[a].ai] = aitable[a].shortcode;
				}
		
				if (aitable[a].qualifiers !== undefined) {
				aiQualifiers[aitable[a].ai] = aitable[a].qualifiers;
				}
		
				if (aitable[a].checkDigit !== undefined) {
				aiCheckDigitPosition[aitable[a].ai] = aitable[a].checkDigit;
				}
			}
		}
		


		function getIdentifiers(ai) {
			return ai.type == "I";
		}

		function getQualifiers(ai) {
			return ai.type == "Q";
		}

		function getDataAttributes(ai) {
			return ai.type == "D";
		}

		function getFixedLength(ai) {
			return ai.fixedLength == true;
		}

		function getVariableLength(ai) {
			return ai.fixedLength == false;
		}

		function getMatchesKeyword(keyword) {
			return function(ai) {
				return ai.title.indexOf(keyword) > -1;
			}
		}

		function getMatchesAI(num) {
			return function(el) {
				return el.ai == num;
			}
		}

		function byLength(length) {
			return function(element) {
				return element.ai.length == length;
			}
		}



		function getAIs(list) {
			let rv=[];
			for (let i in list) {
				rv.push(list[i].ai);
			} 
			return rv;
		}
		


		
		const identifiers=aitable.filter(getIdentifiers);
		const qualifiers=aitable.filter(getQualifiers);
		const dataAttributes=aitable.filter(getDataAttributes);
		const fixedLength=aitable.filter(getFixedLength);
		const variableLength=aitable.filter(getVariableLength);


		const identifierMap={};
		for (let i in identifiers) {
		 identifierMap[identifiers[i].ai]=identifiers[i];
		}

		const qualifierMap={};
		for (let q in qualifiers) {
			if (qualifiers[q] !== undefined) {
				qualifierMap[qualifiers[q].ai]=qualifiers[q];
			}
		}

		const attributeMap={};
		for (let a in dataAttributes) {
			if (dataAttributes[a] !== undefined) {
				attributeMap[dataAttributes[a].ai]=dataAttributes[a];
			}
		}


		const fixedLengthMap={};
		for (let f in fixedLength) {
			if (fixedLength[f] !== undefined) {
				fixedLengthMap[fixedLength[f].ai]=fixedLength[f];
			}
		}

		const variableLengthMap={};
		for (let v in variableLength) {
			if (variableLength[v] !== undefined) {
				variableLengthMap[variableLength[v].ai]=variableLength[v];
			}
		}

		const aiMaps={}
		aiMaps.identifiers=Object.keys(identifierMap);
		aiMaps.qualifiers=Object.keys(qualifierMap);
		aiMaps.dataAttributes=Object.keys(attributeMap);
		aiMaps.fixedLength=Object.keys(fixedLengthMap);
		aiMaps.variableLength=Object.keys(variableLengthMap);


		// TODO - not yet making checks on invalid and mandatory associations of GS1 Application Identifiers

		// from GS1 Gen Specs Figure 4.14.1-1. Invalid pairs of element strings
		// this table is symmetrical
		const invalidAssociations=[
		{"rule":"All occurrences of GTIN SHALL have one value.  It is for example not allowed to include GTINs of other packaging levels.","condition1":"01","condition2":["01"]},
		{"rule":"GTIN of contained trade items is intended to list the trade items contained in a logistic unit, and SHALL NOT be used to identify the contents of a trade item","condition1":"02","condition2":["01"]},
		{"rule":"The count of units contained SHALL only be used with GTIN of contained trade items.","condition1":"37","condition2":["01"]},
		{"rule":"A trade item SHALL NOT be identified as a coupon.","condition1":"255","condition2":["01"]},
		{"rule":"Only one ship to postal code SHALL be applied on the same physical entity","condition1":"420","condition2":["421"]},
		{"rule":"Country of origin, initial processing, processing, or disassembly SHALL NOT be used in combination with country of full porcessing, since this would lead to ambiguous data.","condition1":"426","condition2":["422","423","424","425"]},
		{"rule":"The element strings coupon value, percentage discount of a coupon and loyalty points of a coupon SHALL NOT be applied in combination.","condition1":"390\d","condition2":["394\d","8111"]},
		{"rule":"Only one amount patable element string SHALL be applied on a payment slip.","condition1":"391\d","condition2":["390\d"]},
		{"rule":"Only one amount payable element string SHALL be applied on a variable measure trade item.","condition1":"392\d","condition2":["393\d"]},
		{"rule":"The element strings percentage discount of a coupon and the loyalty points of a coupon SHALL NOT be applied in combination.","condition1":"394\d","condition2":["8111"]},
		{"rule":"The GTIN SHALL NOT be used in combination with the identification of an individual trade item piece.  The GTIN of the trade item to which the individual trade item piece belongs is contained in the element string","condition1":"8006","condition2":["01"]},
		{"rule":"Only one Global Service Relation Number (recipient of provider) SHALL be applied at one time for identification of an individual in a given service relationship","condition1":"8018","condition2":["8017"]},
		];

		// need to also have mandatory association table and forbidden association table from GS1 Gen Specs

		// from Figure 4.14.2-1. Mandatory association of element strings
		// this table is not symmetrical - it's one-way, given condition, require OR, AND, XOR to be satisfied where specified
		const mandatoryAssociations=[
		{"designation":"GTIN of a variable measure trade item scanned at POS","rule":"The GTIN of a variable measure trade item scanned at POS SHALL occur in combination with: * variable count of items; or * a trade measure ; Note: Master data will be needed to determine whether the GTIN represents a variable measure trade item scanned at POS. Also see the note below this table.","condition":["01"],"conditionN1":"0","OR":["30","3\d{3}"]},

		{"designation":"GTIN of a variable measure trade item not scanned at POS","rule":"The GTIN of a variable measure trade item not scanned at POS SHALL occur in combination with: * variable count of items; or * a trade measure; or * the dimensions of a roll product. Note: The first position of the GTIN is '9' for such trade items. Also see the note below this table.","condition":["01","02"],"conditionN1":"9","OR":["30","3\d{3}","8001"]},
		{"designation":"GTIN of a custom trade item.","rule":"The GTIN of a custom trade item SHALL be used in combination with the Made-to-Order variation number. Note: The first position of the GTIN is '9' for such trade items.","condition":["01"],"conditionN1":"9","EXACTLY":["242"]},

		{"designation":"GTIN of contained trade items","rule":"The GTIN of contained trade items SHALL occur in combination with an SSCC and the count of the trade items.","condition":["02"],"AND":["00","37"]},
		{"designation":"Batch/lot number","rule":"Batch/lot number SHALL occur in combination with: * a GTIN; or * a GTIN of contained trade items; or * the identification of an individual trade item piece.","condition":["10"],"XOR":["01","02","8006"]},
		{"designation":"Production date, packaging date, best before date, sell by date, expiration date (of a trade item)","rule":"These dates SHALL occur in combination with: * a GTIN; or * a GTIN of contained trade items; or * the identification of an individual trade item piece.","condition":["11","13","15","16","17"],"XOR":["01","02","8006"]},

		{"designation":"Due date","rule":"The due date SHALL occur in combination with the payment slip reference number and the GLN of the invoicing party","condition":["12"],"AND":["8020","415"]},

		{"designation":"Expiration date (of a coupon)","rule":"The expiration date of a coupon SHALL occur in combination with the GCN.","condition":["17"],"EXACTLY":["255"]},

		{"designation":"","rule":"","condition":["20"],"XOR":["01","02","8006"]},
		{"designation":"","rule":"","condition":["21"],"XOR":["01","8006"]},

		{"designation":"","rule":"","condition":["22"],"EXACTLY":["01"]},
		{"designation":"","rule":"","condition":["240"],"XOR":["01","02","8006"]},
		{"designation":"","rule":"","condition":["241"],"XOR":["01","02","8006"]},

		// *** 242 rule has N1=9 condition on 01,02,8006

		{"designation":"","rule":"","condition":["243"],"EXACTLY":["01"]},

		{"designation":"","rule":"","condition":["250"],"AND":["21"],"XOR":["01","8006"]},

		{"designation":"","rule":"","condition":["251"],"XOR":["01","8006"]},

		{"designation":"","rule":"","condition":["254"],"EXACTLY":["414"]},

		{"designation":"","rule":"","condition":["30"],"XOR":["01","02"]},
		{"designation":"","rule":"","condition":["3\d{3}"],"XOR":["01","02"]},
		{"designation":"","rule":"","condition":["3\d{3}"],"OR":["00","01"]},
		{"designation":"","rule":"","condition":["337\d"],"EXACTLY":["01"]},
		{"designation":"","rule":"","condition":["37"],"EXACTLY":["02"]},
		{"designation":"","rule":"","condition":["390\d"],"AND":["8020","415"]},
		{"designation":"","rule":"","condition":["390\d"],"EXACTLY":["255"]},



		];

		
		const shortCodeToNumeric = {};
		for(let key in aiShortCode){
			shortCodeToNumeric[aiShortCode[key]] = key;
		}
		
		// exposed as public variables that can be accessed by methods
		this.aitable = aitable; 
		this.aiCheckDigitPosition = aiCheckDigitPosition;
		this.aiRegex = aiRegex;
		this.aiMaps = aiMaps;
		this.aiShortCode = aiShortCode;
		this.aiQualifiers = aiQualifiers;
		this.shortCodeToNumeric = shortCodeToNumeric;
		this.tableP = tableP;
		this.tableF = tableF;
		this.tableOpt = tableOpt;
		this.tableOptReverse = tableOptReverse;
		this.safeBase64Alphabet = safeBase64Alphabet;
		this.hexAlphabet = hexAlphabet;
		this.tableS1 = tableS1;
		this.classSemantics = classSemantics;
		this.stringSemantics = stringSemantics;
		this.dateSemantics = dateSemantics;
		this.dateTimeSecondsSemantics = dateTimeSecondsSemantics;
		this.dateTimeMinutesSemantics = dateTimeMinutesSemantics;
		this.quantitativeValueSemantics = quantitativeValueSemantics;
		this.dateRangeSemantics = dateRangeSemantics;

		this.AIsByLength=[];
		for (let i=2; i<=4; i++) {
			this.AIsByLength[i] =getAIs(aitable.filter(byLength(i)));
		}

		this.groupSeparator= String.fromCharCode(29);
		
		this.regexAllNum = regexAllNum;
		this.regexHexLower = regexHexLower;
		this.regexHexUpper = regexHexUpper;
		this.regexSafe64 = regexSafe64;

	}


	numberOfLengthBits(maxLength) {
		return Math.ceil(Math.log(maxLength)/Math.log(2)+0.01);
	}

	numberOfValueBits(valueLength) {
		return Math.ceil(valueLength*Math.log(10)/Math.log(2)+0.01);
	}


	// calculate the expected GS1 Check Digit for a given AI
	// e.g. calculateCheckDigit('01','01234567890128');
	calculateCheckDigit(ai,gs1IDValue) {
		let counter=0;
		let reversed="";
		let total=0;
		let l;
		if (this.aiCheckDigitPosition[ai] == "L") {
			l = gs1IDValue.length;
		} else {
			l = parseInt(this.aiCheckDigitPosition[ai]);
		}
		let multiplier;
		for (let i=l-2; i>=0; i--) {
			let d=gs1IDValue.substring(i,(i+1));
			if ((counter % 2) == 0) {
				multiplier=3;
			} else {
				multiplier=1;
			}
			total+=(d*multiplier);
			counter++;
		}
		let expectedCheckDigit=(10-(total%10))%10;
		return expectedCheckDigit;
	}

	// returns true if the GS1 Check Digit is valid (or not applicable)
	// throws an error if an invalid check digit is present
	// e.g. verifyCheckDigit('01','01234567890128');
	verifyCheckDigit(ai,gs1IDValue) {
		let expectedCheckDigit;
		let rv=true;

		let checkDigitPosition=this.aiCheckDigitPosition[ai];
		if (checkDigitPosition !== undefined) {
			expectedCheckDigit = this.calculateCheckDigit(ai,gs1IDValue);
			if (checkDigitPosition == "L") {
				checkDigitPosition=gs1IDValue.length;
			} else {
				checkDigitPosition=parseInt(checkDigitPosition);
			}
			let actualCheckDigit = parseInt(gs1IDValue.charAt(checkDigitPosition-1));

			if (actualCheckDigit !== expectedCheckDigit) { 
				rv=false;
				throw new Error("INVALID CHECK DIGIT:  An invalid check digit was found for the primary identification key ("+ai+")"+gs1IDValue+" ; the correct check digit should be "+expectedCheckDigit+" at position "+checkDigitPosition);
			}

		}
		return rv;
	}

	// tests the syntax of a value against the regular expression (expected format)
	// throws an error when invalid syntax is detected
	// e.g. verifySyntax('01','01234567890128');
	verifySyntax(ai,value) {
		if ((ai !== null) && (this.regexAllNum.test(ai))) {
			if (!(this.aiRegex[ai].test(value))) {
				throw "SYNTAX ERROR: invalid syntax for value of ("+ai+")"+value;
			}
		}
	}

	// method to percent-encode all reserved characters mentioned in the GS1 Digital Link standard
	percentEncode(input) {
		let charsToEscape="#/%&+,!()*':;<=>?";
		let escaped=[];
		for (let i=0; i<input.length; i++) {
			let testChar = input.substr(i,1);
			if (charsToEscape.indexOf(testChar) > -1) {
				escaped.push("%"+testChar.charCodeAt(0).toString(16).toUpperCase());
			} else {
				escaped.push(testChar);
			}
		}
		return escaped.join("");
	}

	// method to percent-decode all percent-encoded characters
	percentDecode(input) {
		return decodeURIComponent(input);
	}

	padToLength(input,requiredLength) {
		if (input.length < requiredLength) {
			input="0".repeat(requiredLength-input.length)+input;
		}
		return input;
	}


	bin2base64(binstr) {
		let rv="";
		if (binstr.length%6 > 0) {
		 let numberRightPadZeros = 6 - (binstr.length % 6);
		 binstr+= "0".repeat(numberRightPadZeros);
		}
		let numChar = (binstr.length)/6;
		for (let i=0; i<numChar; i++) {
			let binFrag = binstr.substr(6*i,6);
			let base64char = this.safeBase64Alphabet.substr(parseInt(binFrag,2),1);
			rv+=base64char;
		}
		return rv;
	}

	base642bin(base64str) {
		let rv="";
		for (let i=0; i<base64str.length; i++) {
			let dec=this.safeBase64Alphabet.indexOf(base64str.substr(i,1));
			let bin=dec.toString(2);
			if (bin.length < 6) {
				bin="0".repeat(6-bin.length)+bin;
			}
			rv+=bin;
		}
		
		return rv;
	}


	canonical(obj) {
		let rv={};
		let sortedKeys=Object.keys(obj).sort();
		for (let el in sortedKeys ) {
			if (obj.hasOwnProperty(sortedKeys[el])) {
				rv[sortedKeys[el]]=obj[sortedKeys[el]];
			}
		}
		return rv;
	}
	
	binstrToHex(binstr) {
		return parseInt(binstr,2).toString(16).toUpperCase();
	}
	


	// this method will convert either a bracketed element string or an unbracketed element string into an associative array
	// input could be "(01)05412345000013(3103)000189(3923)2172(10)ABC123";
	// or input could be "3103000189010541234500001339232172"+groupSeparator+"10ABC123";
	extractFromGS1elementStrings(elementStrings) {


		// remove symbology identifier if present
		// remove ]C1 or ]e0 or ]d2 or ]Q3
		elementStrings=elementStrings.replace(/^(]C1|]e0|]d2|]Q3)/ , '');

		// check if the initial AI is enclosed within round brackets
		let re=new RegExp("^\\((\\d{2,4}?)\\)");
		if (re.test(elementStrings)) {
			// do this if the input is a bracketed element string
			let r1=new RegExp("\\((\\d{2,4}?)\\)|([^(]+)","g");
			let aikeys = Object.keys(this.aiRegex);
			let obj={};
			let k;
			if (r1.test(elementStrings)) {
				let results=elementStrings.match(r1);
				for (let a in results) {
					if (a%2 == 0) {
						let l=results[a].length;
						k=results[a].substr(1,(l-2));
					} else {
						if (aikeys.includes(k)) {
							if (this.aiRegex[k].test(results[a])) {
								obj[k]=results[a];
							} else {
								throw new Error("SYNTAX ERROR: invalid syntax for value of ("+k+") : "+results[a]);
							}
						}
					}
				}
			}
			return obj;
		} else {
			// else do this if the input is an unbracketed element string
			// changed logic here to make use of fixedLengthTable and flowchart from GenSpecs

			let elementStringsLength=elementStrings.length;

			const fixedLengths={"00":20,"01":16,"02":16,"03":16,"04":18,"11":8,"12":8,"13":8,"14":8,"15":8,"16":8,"17":8,"18":8,"19":8,"20":4,"31":10,"32":10,"33":10,"34":10,"35":10,"36":10,"41":16}
			const fixedLengthAIs=Object.keys(fixedLengths);
			const gs=String.fromCharCode(29);
			let cursor=0;
			let buffer=[];

			// is any data present?

			do {

				// are the first two digits in table of fixedLengths
				let firstTwoDigits=elementStrings.substr(cursor,2)

				if (fixedLengthAIs.indexOf(firstTwoDigits) > -1) {
					// the first two digits are within the array of GS1 Application Identifiers of defined fixed length
	
					// extract the AI and value to the buffer
						let l = fixedLengths[firstTwoDigits];
						buffer.push(elementStrings.substr(cursor,l));
						cursor+=l;
	
					// if the next character is the group separator, move past it
					if (elementStrings.substr(cursor,1) == gs) {
						cursor++;
					}
	
	
				} else {
					// the first two digits are not within the array of GS1 Application Identifiers of defined fixed length
	
					// if string contains group separator
					let gsloc = elementStrings.substr(cursor).indexOf(gs);
					if (gsloc > -1) {
						// extract the AI and value up to the group separator to the buffer
						buffer.push(elementStrings.substr(cursor).substr(0,gsloc));
						cursor+=gsloc;
						cursor++;
		
					} else {
					// extract the AI and value to the buffer
						buffer.push(elementStrings.substr(cursor));
						cursor=elementStringsLength;
					}

				}

			} while (cursor < elementStringsLength);


			// process the buffer;

			let obj={};
			let aiCandidate="";
			let matched=false;
			for (let i=0; i<buffer.length; i++) {
				let el = buffer[i];
				
				for (let k=2; k<=4; k++) {
					aiCandidate=el.substr(0,k);
					if (this.AIsByLength[k].indexOf(aiCandidate) > -1) {
						obj[aiCandidate] = el.substr(k);
						matched=true;
					}
				}

				if (!matched) {
					throw new Error("No matching GS1 AI found for "+el);
				}	
			}

			return obj;
		}
	}

	// this method converts an associative array of GS1 Application Identifiers and their values into a GS1 Digital Link URI
	// set useShortText = true if you wish to use alphabetic mnemonic short names, e.g. /gtin/ instead of /01/
	// set uriStem to a value e.g. 'https://example.org' if you wish to use a specific domain name
	// setting uriStem to null, undefined or "" defaults to 'https://id.gs1.org' as the reference domain
	buildGS1digitalLink(gs1AIarray,useShortText,uriStem,nonGS1keyvaluePairs) {
		let identifiers=[];
		let qualifiers=[];
		let attributes=[];
		let fixedLengthValues=[];
		let variableLengthValues=[];
		let otherKeys=[];
	
		let valid=true;
		let path="";
		let queryStringArray=[];
		let queryString="";
		let webURI="";
		let canonicalStem="https://id.gs1.org";
		let rv={};

		// Need to remove unwanted trailing slash
		if ((uriStem !== undefined) && (uriStem !== null) && (uriStem !== "") && (uriStem.endsWith("/"))) {
			uriStem=uriStem.substr(0,uriStem.length-1)+path+queryString;				
		}


		for (let a in gs1AIarray) {
			let other=true;
			if (this.aiMaps.identifiers.includes(a)) {
				identifiers.push(a);
				other=false;
			}
			if (this.aiMaps.qualifiers.includes(a)) {
				qualifiers.push(a);
				other=false;
			}
			if (this.aiMaps.dataAttributes.includes(a)) {
				attributes.push(a);
				other=false;
			}
			if (this.aiMaps.fixedLength.includes(a)) {
				fixedLengthValues.push(a);
				other=false;
			}
			if (this.aiMaps.variableLength.includes(a)) {
				variableLengthValues.push(a);
				other=false;
			}
			if (other) {
				otherKeys.push(a);
			}
		}

		// Start building Web URI path expression
		// need exactly one identifier key

		if (identifiers.length !== 1) {
			valid=false;
			throw new Error("The element string should contain exactly one primary identification key - it contained "+identifiers.length+" "+JSON.stringify(identifiers)+"; please check for a syntax error");
		} else {

			this.verifySyntax(identifiers[0],gs1AIarray[identifiers[0]]);

		
			this.verifyCheckDigit(identifiers[0],gs1AIarray[identifiers[0]]);

		

						if (useShortText) {
							// Using short text names
							if (this.aiShortCode[identifiers[0]] !== undefined) {
								path="/"+this.aiShortCode[identifiers[0]]+"/"+this.percentEncode(gs1AIarray[identifiers[0]]);			
							} else {
								path="/"+identifiers[0]+"/"+this.percentEncode(gs1AIarray[identifiers[0]]);
							}
						} else {
							// Using numeric AIs
							path="/"+identifiers[0]+"/"+this.percentEncode(gs1AIarray[identifiers[0]]);
						}

					// append any data qualifiers in the expected order, as specified in this.aiQualifiers[identifiers[0]]
	
					if (this.aiQualifiers[identifiers[0]] !== undefined) {
						for (let j in this.aiQualifiers[identifiers[0]]) {
							let q=this.aiQualifiers[identifiers[0]][j]
							if (qualifiers.includes(q)) {

						if (useShortText) {
							// Using short text names
							if (this.aiShortCode[q] !== undefined) {
								path+="/"+this.aiShortCode[q]+"/"+this.percentEncode(gs1AIarray[q]);			
							} else {
								path+="/"+q+"/"+this.percentEncode(gs1AIarray[q]);
							}
						} else {
							// Using numeric AIs
							path+="/"+q+"/"+this.percentEncode(gs1AIarray[q]);
						}

							}
						}
					}
	
					// if there are any data attributes, we need to add these to the query string
	
					if (attributes.length >0) {

						for (let k in attributes) {
							let a=attributes[k];
					
							if (useShortText) {
								// Using short text names
								if (this.aiShortCode[a] !== undefined) {
									queryStringArray.push(this.aiShortCode[a]+"="+this.percentEncode(gs1AIarray[a]));			
								} else {
									queryStringArray.push(a+"="+this.percentEncode(gs1AIarray[a]));
								}
							} else {
								// Using numeric AIs
								queryStringArray.push(a+"="+this.percentEncode(gs1AIarray[a]));
							}					
						}
						queryString="?"+queryStringArray.join("&");
				
		
					}

				if ((uriStem == null) || (uriStem == "")) {
					// prepare a canonical Web URI
					webURI=canonicalStem+path+queryString;	
				} else {
					webURI=uriStem+path+queryString;
				}

				if (otherKeys.length > 0) {
					let queryStringArray=[];
					for (let iok in otherKeys) {
						queryStringArray.push(otherKeys[iok]+"="+gs1AIarray[otherKeys[iok]]);
					}
					if (queryString== "") {
						webURI+="?"+queryStringArray.join("&");
					} else {
						webURI+="&"+queryStringArray.join("&");					
					}
				}

				if ( (nonGS1keyvaluePairs !== {}) && (Object.keys(nonGS1keyvaluePairs).length > 0) ) {
					let queryStringArray=[];
					let keys=Object.keys(nonGS1keyvaluePairs);
					for (let iok in keys) {
						let key=keys[iok];
						queryStringArray.push(key+"="+nonGS1keyvaluePairs[key]);
					}
					if (queryString== "") {
						webURI+="?"+queryStringArray.join("&");
					} else {
						webURI+="&"+queryStringArray.join("&");					
					}
				}
	

		}
			

		return webURI;	
	}


	// new method that converts a flat associative array of GS1 Application Identifiers and their values into a more structured object in which the primary identification key, key qualifiers, data attributes and other key=value pairs from the URI string are clearly identified as such.
	buildStructuredArray(gs1AIarray,otherArray) {
		let keys=["identifiers","qualifiers","dataAttributes"];
		let map={};
		map.identifiers=[];
		map.qualifiers=[];
		map.dataAttributes=[];
		map.other=[];
		
		let valid=true;
		let path="";
		let queryStringArray=[];
		let rv={};

		for (let a in gs1AIarray) {
			let b={};
			b[a]=gs1AIarray[a];
			let other=true;

			for (let k in keys) {
				if (this.aiMaps[keys[k]].includes(a)) {
					map[keys[k]].push(b);
					other=false;
				}			
			}

			if (other) {
				map.other.push(b);
			}
		}

		for (let a in otherArray) {
			let b={};
			b[a]=otherArray[a];
			map.other.push(b);
		}
		
		// need exactly one identifier key
		if (map.identifiers.length !== 1) {
			valid=false;
			throw new Error("The element string should contain exactly one primary identification key - it contained "+map.identifiers.length+" "+JSON.stringify(map.identifiers)+"; please check for a syntax error");
		} else {
			this.verifySyntax(map.identifiers[0],gs1AIarray[map.identifiers[0]]);
			this.verifyCheckDigit(map.identifiers[0],gs1AIarray[map.identifiers[0]]);
		}
		return map;
	}
	
	
	analyseURIsemantics(gs1DigitalLinkURI) {
		let rv=this.analyseURI(gs1DigitalLinkURI,true);
		let uncompressedDL=gs1DigitalLinkURI;
				
		if ((rv.detected == "fully compressed GS1 Digital Link") || (rv.detected == "partially compressed GS1 Digital Link")) {
			uncompressedDL=this.decompressGS1DigitalLink(gs1DigitalLinkURI,false,rv.uriStem);	
			
		}
		let qpos=uncompressedDL.indexOf("?");
		let excludeQueryString=uncompressedDL.substr(0,qpos);
		
		
		let rv2=this.analyseURI(excludeQueryString,false);

		
		let identifiers = rv.structuredOutput.identifiers;
		let qualifiers = rv.structuredOutput.qualifiers;
		let dataAttributes = rv.structuredOutput.dataAttributes;
		let nonID={};
		let elementStrings={};
		for (let q in qualifiers) {
			let k = Object.keys(qualifiers[q]);
			for (let ki in k) {
				nonID[k[ki]] = qualifiers[q][k[ki]];
				elementStrings[k[ki]] = qualifiers[q][k[ki]];
			}
		}
		for (let a in dataAttributes) {
			let m = Object.keys(dataAttributes[a]);
			for (let ki in m) {
				nonID[m[ki]] = dataAttributes[a][m[ki]];
				elementStrings[m[ki]] = dataAttributes[a][m[ki]];
			}
		}
		for (let i in identifiers) {
			let k = Object.keys(identifiers[i]);
			for (let ki in k) {
				elementStrings[k[ki]] = identifiers[i][k[ki]];
			}		
		}
		
		
		rv.nonID = nonID;
		let nonIDKeys = Object.keys(rv.nonID);		
		let aiKeys = Object.keys(elementStrings);
		

		rv.primaryIdentifierMap = rv.structuredOutput.identifiers[0];
		
		let pimK = Object.keys(rv.primaryIdentifierMap);
		
		rv.primaryIdentifier = pimK[0];
		
		let iiaqK = Object.keys(this.tableS1);
		let isInstanceIdentifier=false;
		let outputObject={};

		let context={"schema":"http://schema.org/","gs1":"https://gs1.org/voc/","rdf":"http://www.w3.org/1999/02/22-rdf-syntax-ns#","rdfs":"http://www.w3.org/2000/01/rdf-schema#","owl":"http://www.w3.org/2002/07/owl#","dcterms":"http://purl.org/dc/terms/","xsd":"http://www.w3.org/2001/XMLSchema#","skos":"http://www.w3.org/2004/02/skos/core#","gs1:value":{"@type":"xsd:float"}};

				
		if (iiaqK.includes(rv.primaryIdentifier)) {
			let iiaqV = this.tableS1[rv.primaryIdentifier];

			if ((iiaqV.hasOwnProperty("minLength")) && (iiaqV.minLength !== null)) {
				if (rv.primaryIdentifier.length >= iiaqV.minLength) {
					isInstanceIdentifier=true;
				}
			}
			
			if (iiaqV.hasOwnProperty("requires")) {
				if (iiaqV.requires == null) {
				  isInstanceIdentifier=true;
				} else {
					for (let v in iiaqV.requires) {
					  if (nonIDKeys.includes(iiaqV.requires[v])) {
						isInstanceIdentifier=true;
					  }
					}
				}
			}
			
		}
		
		if (isInstanceIdentifier) {
		outputObject["@id"]=excludeQueryString; // this is now the uncompressed GS1 Digital Link without the query string
		let osa = [uncompressedDL];
		if (gs1DigitalLinkURI !== uncompressedDL) {
		osa.push(gs1DigitalLinkURI);
		}
//		osa.push(canonical);
		
		outputObject["owl:sameAs"]=osa;
		} else {
		outputObject["@id"]="_:1";
		}

		rv.isInstanceIdentifier = isInstanceIdentifier;
		
		let csK = Object.keys(this.classSemantics);
		let ssK = Object.keys(this.stringSemantics);
		let qvK = Object.keys(this.quantitativeValueSemantics);
		let dvK = Object.keys(this.dateSemantics);
		let dtsvK = Object.keys(this.dateTimeSecondsSemantics);
		let dtmvK = Object.keys(this.dateTimeMinutesSemantics);
		let drK = Object.keys(this.dateRangeSemantics);
		
		// handle AIs for which class semantics are defined
		
		let otype = ["rdfs:Class","owl:Class"];
		for (let i in csK) {
			if (aiKeys.includes(csK[i])) {
				let c = this.classSemantics[csK[i]];
				otype=otype.concat(c);
			}
		}		
		outputObject["@type"]=otype;
		
		
		// walk up the path information
		let uriStem=rv2.uriStem;
		let pathComponents=rv2.pathComponents.substr(1).split("/");
		if ((pathComponents.length > 2) && ((pathComponents.length%2) ==0)) {
			let l = pathComponents.length-2;
			let superClasses=[];
			do {
			let sl=pathComponents.slice(0,l);
			let superClass=uriStem+"/"+sl.join("/");
			superClasses.push({"@id":superClass});
			l=l-2;
			} while (l >= 2);
			if (superClasses.length > 0) {
			outputObject["dcterms:isPartOf"]=superClasses;
			outputObject["rdfs:subClassOf"]=superClasses;
			}

		
		}
		
		
		
		
		// handle AIs and predicates that expect a string value
		
		for (let i in ssK) {
			if (aiKeys.includes(ssK[i])) {
				for (let j in this.stringSemantics[ssK[i]]) {
					let predicate = this.stringSemantics[ssK[i]][j];
					let value = elementStrings[ssK[i]]
					outputObject[predicate]=value;
				}
			}
		}
		
		// handle AIs and predicates that expect a quantitative value
		for (let i in qvK) {
			if (aiKeys.includes(qvK[i])) {
					let predicate = this.quantitativeValueSemantics[qvK[i]]["p"][0];
					let rec20=this.quantitativeValueSemantics[qvK[i]]["rec20"];
					let bareValue = elementStrings[qvK[i]];
					let fourthDigit = qvK[i].charAt(3);
					let value=bareValue;
					for (let i=0; i<fourthDigit; i++) {
					value=value/10;
					}
					let qv={};
					qv["@type"]="gs1:QuantitativeValue";
					qv["gs1:unitCode"]=rec20;
					qv["gs1:value"]=value.toString();
					outputObject[predicate]=qv;
			}
		}
		
		// handle AIs and predicates that expect a date value
		for (let i in dvK) {
			if (aiKeys.includes(dvK[i])) {
				for (let j in this.dateSemantics[dvK[i]]) {
					let predicate = this.dateSemantics[dvK[i]][j];
					context[predicate]={"@type":"xsd:date"};
					let bareValue = elementStrings[dvK[i]];
					let xsdDateValue = sixDigitToXsdDate(bareValue);
					outputObject[predicate]=xsdDateValue;
				}		
			}
		}
		
		
		
		
		// handle AIs and predicates that expect a dateTime value with second precision, e.g. AI 8008
		for (let i in dtsvK) {
			if (aiKeys.includes(dtsvK[i])) {
				for (let j in this.dateTimeSecondsSemantics[dtsvK[i]]) {
					let predicate = this.dateTimeSecondsSemantics[dtsvK[i]][j];
					context[predicate]={"@type":"xsd:dateTime"};
					let bareValue = elementStrings[dtsvK[i]];
					let xsdDateTimeValue = maxTwelveDigitToXsdDateTime(bareValue);
					outputObject[predicate]=xsdDateTimeValue;
				}		
			}
		}

		// handle AIs and predicates that expect a dateTime value with minute precision, e.g. AI 7003
		for (let i in dtmvK) {
			if (aiKeys.includes(dtmvK[i])) {
				for (let j in this.dateTimeMinutesSemantics[dtmvK[i]]) {
					let predicate = this.dateTimeMinutesSemantics[dtmvK[i]][j];
					context[predicate]={"@type":"xsd:dateTime"};
					let bareValue = elementStrings[dtmvK[i]];
					let xsdDateTimeValue = tenDigitToXsdDateTime(bareValue);
					outputObject[predicate]=xsdDateTimeValue;
				}		
			}
		}
		
		// handle AIs and predicates that expect a date range, e.g. AI 7007
		for (let i in drK) {
			if (aiKeys.includes(drK[i])) {
				for (let j in this.dateRangeSemantics[drK[i]]) {
					let predicate = this.dateRangeSemantics[drK[i]][j];
					let bareValue=elementStrings[drK[i]];
					if (bareValue.length == 6) {
						let xsdDateValue = sixDigitToXsdDate(bareValue);
						context[predicate]={"@type":"xsd:dateTime"};
						outputObject[predicate]=xsdDateValue;
					} else {
						if (bareValue.length == 12) {
							let xsdStartDateValue = sixDigitToXsdDate(bareValue.substr(0,6));
							let xsdEndDateValue = sixDigitToXsdDate(bareValue.substr(6,6));
							context[predicate+"Start"]={"@type":"xsd:dateTime"};
							context[predicate+"End"]={"@type":"xsd:dateTime"};
							outputObject[predicate+"Start"]=xsdStartDateValue;
							outputObject[predicate+"End"]=xsdEndDateValue;
						}
					}
				
				}
			}
		}
		
		outputObject["gs1:elementStrings"]=rv.elementStringsOutput;
		
		
		
		rv.semantics = Object.assign({"@context":context}, outputObject);
		
		return rv.semantics;
		
		function tenDigitToXsdDateTime(tenDigit) {
			var re=new RegExp("\\d{2}(?:12|11|0\\d)(?:31|30|2\\d|1\\d|0[1-9])(?:0\\d|1\\d|2[0-4])(?:[0-5]\\d)");
			if (!(re.test(tenDigit))) {
				throw new Error("input to date conversion did not match valid YYMMDDhhmm pattern");
			} else {
				var year=tenDigit.substr(0,2);
				var month=tenDigit.substr(2,2);
				var day=tenDigit.substr(4,2);
				var hour=tenDigit.substr(6,2);
				var mins=tenDigit.substr(8,2);
				var intendedYear = determineFourDigitYear(year);
		
				var intendedDateTime=intendedYear+"-"+month+"-"+day+"T"+hour+":"+mins+":00";
				return intendedDateTime;
			}
		}

		function maxTwelveDigitToXsdDateTime(twelveDigit) {
			var re=new RegExp("\\d{2}(?:12|11|0\\d)(?:31|30|2\\d|1\\d|0[1-9])(?:0\\d|1\\d|2[0-4])(?:[0-5]\\d)?(?:[0-5]\\d)?");
			if (!(re.test(twelveDigit))) {
				throw new Error("input to date conversion did not match valid YYMMDDhh[mm][ss] pattern");
			} else {
				var year=twelveDigit.substr(0,2);
				var month=twelveDigit.substr(2,2);
				var day=twelveDigit.substr(4,2);
				var hour=twelveDigit.substr(6,2);
				var min;
				var sec;
				if (twelveDigit.length > 8) {
					min=twelveDigit.substr(8,2);
				} else {
					min="00";
				}

				if (twelveDigit.length > 10) {
					sec=twelveDigit.substr(10,2);
				} else {
					sec="00";
				}
				
				var intendedYear = determineFourDigitYear(year);
		
				var intendedDateTime=intendedYear+"-"+month+"-"+day+"T"+hour+":"+min+":"+sec;
				return intendedDateTime;
			}
		}


		function determineFourDigitYear(year) {
				var dt = new Date();
				var currentYear = 1900+dt.getYear();	
				var currentCentury=(""+currentYear).substr(0,2);
				var difference = year - (currentYear % 100);
				var intendedYear;
				if ((difference >= 51) && (difference <=99)) {
					intendedYear = (currentCentury-1)+year;
				} else {
					if ((difference >= -99) && (difference <= -50)) {
						intendedYear = (currentCentury-(-1))+year;
					} else {
						intendedYear = currentCentury+year;
					}
				}
			return intendedYear;
		}


		function sixDigitToXsdDate(sixDigit) {
			var re=new RegExp("\\d{2}(?:12|11|0\\d)(?:31|30|2\\d|1\\d|0\\d)");
			if (!(re.test(sixDigit))) {
				throw new Error("input to date conversion did not match valid YYMMDD pattern");
			} else {
				var year=sixDigit.substr(0,2);
				var month=sixDigit.substr(2,2);
				var day=sixDigit.substr(4,2);

				var intendedYear = determineFourDigitYear(year);

		
				var lastDay=31;
				if ((month == "04") || (month == "06") || (month == "09") || (month == "11")) {
					lastDay=30;
				} 
				if (month == "02") {
					lastDay=28;
					if ( ( (intendedYear % 400) == 0 ) || ( ( (intendedYear % 4)==0) && !((intendedYear % 100) == 0) ) ) {
						lastDay=29;
					}
				}
		
				if ((day-0) > lastDay) {
					throw new Error("input to date conversion was a YYMMDD pattern with a value of DD too large for MM, e.g. 31st of June, 30th of February");
				}
		
		
				var intendedDate;

				if (day == "00") {
					intendedDate=intendedYear+"-"+month+"-"+lastDay;
				} else {
					intendedDate=intendedYear+"-"+month+"-"+day;
				}

				return intendedDate;
				}
		}
		
		
		
		
	}
	
	analyseURI(gs1DigitalLinkURI,extended) {
		let rv={};
	
		rv.fragment="";
		let fi = gs1DigitalLinkURI.indexOf("#"); 

		let beforeFragment = gs1DigitalLinkURI;

		if (fi > -1) {
			rv.fragment = gs1DigitalLinkURI.substr(1+fi);
			beforeFragment = gs1DigitalLinkURI.substr(0,fi);
		}
		
		rv.queryString="";
		
		let beforeQueryString = beforeFragment;
		let qs=beforeFragment.indexOf("?");
		if (qs> -1) {
			rv.queryString = beforeFragment.substr(1+qs);
			beforeQueryString = beforeFragment.substr(0,qs);
		}

		// disregard any trailing forward slash
		let bql = beforeQueryString.length;
		if (beforeQueryString.substr(bql-1,1)== "/") {
		beforeQueryString = beforeQueryString.substr(0,bql-1);
		}

		let cursor=0;
		if (beforeQueryString.indexOf("http://") == 0) { cursor=7 }
		if (beforeQueryString.indexOf("https://") == 0) { cursor=8 }

		let protocol=beforeQueryString.substr(0,cursor);
		let afterProtocol = beforeQueryString.substr(cursor);

		let firstSlashOfAllPath = afterProtocol.indexOf("/");
		
		let pathInfo = afterProtocol.substr(1+firstSlashOfAllPath);

		rv.uriPathInfo="/"+pathInfo;

		let domain = afterProtocol.substr(0,firstSlashOfAllPath);
	
		let pathComponents=pathInfo.split("/");


		// iterate through pathComponents to find the path component corresponding to a primary GS1 ID key
		let relevantPathComponents=[];
		let uriStemPathComponents=[];
		let pcr=pathComponents.reverse();
		let pcl=pathComponents.length;
		let pci=pcl;
		let searching=true;
		let numericPrimaryIdentifier="";
		for (let i in pcr) {
			let numkey="";
			let pcc = pcr[i];
			if (this.regexAllNum.test(pcc)) {
				numkey=pcc;	
			} else {
				if (this.shortCodeToNumeric.hasOwnProperty(pcc)) {
					numkey=this.shortCodeToNumeric[pcc];
				}
			}
			
			if ((numkey !== "") && searching) {
						if (this.aiMaps.identifiers.indexOf(numkey) > -1)  {
							searching=false;
							pci=pcl-i;
							numericPrimaryIdentifier = numkey;
							relevantPathComponents=pcr.slice(0,(parseInt(i)+1)).reverse();
							uriStemPathComponents=pcr.slice(parseInt(i)+1).reverse();
						}				
			}
		}

		if (relevantPathComponents.length > 0) {
			rv.pathComponents = "/"+relevantPathComponents.join("/");
		} else {
			rv.pathComponents= "";
		}
		
		if (uriStemPathComponents.length > 0) {
			rv.uriStem = protocol+domain+"/"+uriStemPathComponents.join("/");
		} else {
			rv.uriStem=protocol+domain;
		}
		
			
		// if semicolon was used as delimiter between key=value pairs, replace with ampersand as delimiter
		rv.queryString = rv.queryString.replace(new RegExp(";", 'g'),"&");


		// process URI path information
		let pathCandidates={};
		let pathElements = pathInfo.split("/");
		let l = pathElements.length;
		let pathElementIndex=l-2;
		while (pathElementIndex >= 0) {
			pathCandidates[pathElements[pathElementIndex]]=this.percentDecode(pathElements[1+pathElementIndex]);
			pathElementIndex-=2;
		}

		let queryStringCandidates={};
		if (rv.queryString !== "") {
			
			let pairs = rv.queryString.split("&");
			for (let i=0; i<pairs.length; i++) {
				let p = pairs[i].split("=");
				if ((p[0] !== null) && (p[1] !== null)) {
				
					if (this.shortCodeToNumeric.hasOwnProperty(p[0])) {
						queryStringCandidates[this.shortCodeToNumeric[p[0]]]=this.percentDecode(p[1]);
						delete queryStringCandidates[p[0]];
					} else {
						queryStringCandidates[p[0]]=this.percentDecode(p[1]);
					}
				
				}
			}
		}
		
		
		rv.pathCandidates = pathCandidates;
		rv.queryStringCandidates = queryStringCandidates;
		
		rv.detected="";
		
		rv.uncompressedPath="";
		rv.compressedPath="";
		rv.structuredOutput="";
		
		if ((relevantPathComponents.length > 0) && ((relevantPathComponents.length % 2) == 0)) {
			if (this.aiRegex[numericPrimaryIdentifier].test(relevantPathComponents[1])) {
				rv.detected = "uncompressed GS1 Digital Link";
			
				rv.uncompressedPath = "/"+relevantPathComponents.join("/");

				
				if (extended) {
					let extracted = this.extractFromGS1digitalLink(gs1DigitalLinkURI);
					let gs1AIarray = extracted.GS1;
					let otherArray = extracted.other;
					let structuredArray = this.buildStructuredArray(gs1AIarray,otherArray);	
					rv.structuredOutput=structuredArray;
					rv.elementStringsOutput=this.gs1digitalLinkToGS1elementStrings(gs1DigitalLinkURI,true);
				}
			}
		}
		
		if ((relevantPathComponents.length == 3) && (this.regexSafe64.test(relevantPathComponents[2]))) {
			if (this.aiRegex[numericPrimaryIdentifier].test(relevantPathComponents[1])) {
				rv.detected = "partially compressed GS1 Digital Link";
				rv.uncompressedPath = "/"+relevantPathComponents.slice(0,2).join("/");
				rv.compressedPath = relevantPathComponents[2];
				
				if (extended) {
					let extracted = this.extractFromCompressedGS1digitalLink(gs1DigitalLinkURI);
					let gs1AIarray = extracted.GS1;
					let otherArray = extracted.other;
					let structuredArray = this.buildStructuredArray(gs1AIarray,otherArray);	
					rv.structuredOutput=structuredArray;
					rv.elementStringsOutput=this.gs1compressedDigitalLinkToGS1elementStrings(gs1DigitalLinkURI,true);
				}
			}
		}
		
		if ((rv.detected == "") && (this.regexSafe64.test(pcr[0])) && (protocol !== "")) {
			rv.detected = "fully compressed GS1 Digital Link";
			rv.uncompressedPath="";
			rv.compressedPath=pcr[0];

			if (extended) {
				let extracted = this.extractFromCompressedGS1digitalLink(gs1DigitalLinkURI);
				let gs1AIarray = extracted.GS1;
				let otherArray = extracted.other;
				let structuredArray = this.buildStructuredArray(gs1AIarray,otherArray);	
				rv.structuredOutput=structuredArray;
				rv.elementStringsOutput=this.gs1compressedDigitalLinkToGS1elementStrings(gs1DigitalLinkURI,true);
			}
		}
	
		return rv;
	}


	// this method converts a GS1 Digital Link URI into an associative array of GS1 Application Identifiers and their values
	// it is the inverse function of buildGS1gs1DigitalLinkURI(gs1AIarray,useShortText,uriStem)
	extractFromGS1digitalLink(gs1DigitalLinkURI) {
		// initialise internal variables
		let obj={};
		let rv={};

		// extract path info and query string from URI and parse these to extract AI key:value pairs
//		let s=this.analyseURI(gs1DigitalLinkURI,false);
		

		let s=this.analyseURI(gs1DigitalLinkURI,false);
		let queryString=s.queryString;
		let uriPathInfo=s.uriPathInfo; 
		let pathCandidates = s.pathCandidates;
		let queryStringCandidates = s.queryStringCandidates;
		let nonGS1queryStringCandidates={};
		
		// merge pathCandidates and queryStringCandidates into a combined associative array, candidates
		let candidates = Object.assign({},pathCandidates, queryStringCandidates);

		// process candidates;
		for (let k in candidates) {
			if (candidates.hasOwnProperty(k)) {
			   if (!(this.regexAllNum.test(k))) {
					// for keys that are not all-numeric, attempt to convert to all-numeric AI equivalent
			   		if (this.shortCodeToNumeric.hasOwnProperty(k)) {
			   			let numkey = this.shortCodeToNumeric[k];
			   			candidates[numkey]=candidates[k];
			   			delete candidates[k];
			   		} else {
			   			// or otherwise remove from candidates map if it doesn't relate to a GS1 Application Identifier
			   			nonGS1queryStringCandidates[k]=candidates[k];
			   			delete candidates[k];
			   			
			   		}
			   }
			}
	    }			
				
		for (let k in candidates) {
			if (candidates.hasOwnProperty(k)) {
					this.verifySyntax(k,candidates[k]);
					this.verifyCheckDigit(k,candidates[k]);
					obj[k] = padGTIN(k,candidates[k]);
			}
		}
				
		rv.GS1=obj;	
		rv.other=nonGS1queryStringCandidates;

		return rv;



		function padGTIN(ai,value) {
			// always pad the value of any GTIN [ AI (01) or (02) ] to 14 digits in element string representation
			let newvalue=value;
			if ((ai == "01") || (ai == "(01)") || (ai == "02") || (ai == "(02)")) {
				if (value.length==8) { newvalue = '000000'+value; }
				if (value.length==12) { newvalue = '00'+value; }
				if (value.length==13) { newvalue = '0'+value; }
			}
			return newvalue;
		}


	}



	// this method converts a GS1 Digital Link URI into an associative array of GS1 Application Identifiers and their values
	// it is the inverse function of buildGS1gs1DigitalLinkURI(gs1AIarray,useShortText,uriStem)
	extractFromCompressedGS1digitalLink(gs1DigitalLinkURI) {
		// initialise internal variables
		let objGS1={};
		let objOther={};
		let rv={};

		// set cursor to 0 = start reading from the left-most part of the gs1 Digital Link URI provided as input
		let s=this.analyseURI(gs1DigitalLinkURI,false);
		
		let queryString=s.queryString;
		let uriPathInfo=s.uriPathInfo; 
		let candidates=s.pathCandidates;
		let queryStringCandidates = s.queryStringCandidates;
		let nonGS1queryStringCandidates={};

		if (queryString !== "") {
			// if semicolon was used as delimiter between key=value pairs, replace with ampersand as delimiter
			queryString = queryString.replace(new RegExp(";", 'g'),"&");

			let firstFragment = queryString.indexOf("#");
			if (firstFragment > -1) {
				queryString = queryString.substring(0,firstFragment);
			}
			
			let pairs = queryString.split("&");
			for (let i=0; i<pairs.length; i++) {
				let p = pairs[i].split("=");
				// if the key is not numeric AND is not a shortcode such as exp or expdt, then add to the nonGS1keyvalueePairs
				if ((p[0] !== null) && (p[1] !== null) && (!(this.regexAllNum.test(p[0])) && (!(this.shortCodeToNumeric.hasOwnProperty(p[0]))))) {
					nonGS1queryStringCandidates[p[0]]=this.percentDecode(p[1]);
				}
			}
		}

		// TODO for a partially compressed http://example.org/AQnYUc1gmiERBhQ0ytiyZuAGOLc1TQ?expdt=1903061658&k1=v1
		// expdt:1903061658 is appearing in queryStringCandidates
		
		// TODO also for fully compressed http://example.org/AQnYUc1gmiERBhQ0ytiyZuAGOLc1TXhXsaXbQKHFuaprwUmrBX6g
		// expdt:1903061658 is appearing in queryStringCandidates
		
		// TODO correct splitURIintoComponents to consider shortCode appearing within query string key=value pairs
		
		// remove initial forward slash
		uriPathInfo=uriPathInfo.substr(1);

		if (this.regexSafe64.test(uriPathInfo)) {
			let binstr=this.base642bin(uriPathInfo);
			objGS1=this.decompressBinaryToGS1AIarray(binstr);
		} else {
			// handle situation where the primary identification key is not compressed
			let index1=uriPathInfo.indexOf("/");
			let index2=uriPathInfo.lastIndexOf("/");
			let gs1primaryKey=uriPathInfo.substr(0,index1);
			let base64segment=uriPathInfo.substr(1+index2);
			let gs1primaryKeyValue=uriPathInfo.substr(1+index1,index2-index1-1);
			objGS1=this.decompressBinaryToGS1AIarray(this.base642bin(base64segment));
			if (this.regexAllNum.test(gs1primaryKey)) {
				objGS1[gs1primaryKey]=gs1primaryKeyValue;
			} else {
				if (this.shortCodeToNumeric.hasOwnProperty(gs1primaryKey)) {
					objGS1[this.shortCodeToNumeric[gs1primaryKey]]=gs1primaryKeyValue;
				}
			}
		}




		// insert into associative array return value any key=value pairs from the URI query string that were not compressed
		for (let k in objGS1) {
		// need to change this to check whether key is exp / expdt or numeric GS1 key - see related method ~ refactor lines 951-967
/*			if ((this.regexAllNum.test(k)) || (this.shortCodeToNumeric.hasOwnProperty(k))) {
				objGS1[this.shortCodeToNumeric[k]]=objGS1[k];
			} else {
				objOther[k]=objGS1[k];
			}
*/

			// TODO correct decompressBinaryToGS1AIarray so that expdt and 7003 do not both appear in the returned arrayc
			
			// if the key is not all-numeric and is not exp or expdt, then move it into objOther and delete from objGS1
			if (!(this.regexAllNum.test(k)) && (!(this.shortCodeToNumeric.hasOwnProperty(k)))) {
				nonGS1queryStringCandidates[k]=objGS1[k];
				delete objGS1[k];
			}

		}


		rv.GS1=objGS1;
		rv.other=nonGS1queryStringCandidates;
		
		return rv;
		
	}

	

	// this method converts an associative array of GS1 Application Identifiers and their values into concatenated GS1 element strings
	// set brackets=true if you want a human-readable concatenation with round brackets around GS1 Application Identifiers
	// set brackets=false if you don't; in this case the group separator will be used to mark the end of any field that is not defined length, except for the last element string in the concatenation
	buildGS1elementStrings(gs1AIarray,brackets) {
		// if brackets=true, use GS1 Digital Link ordering - identifier, qualifiers then data attributes in numeric order
		
		let identifiers=[];
		let qualifiers=[];
		let attributes=[];
		let fixedLengthValues=[];
		let variableLengthValues=[];
		let elementStrings=[];
	
		for (let a in gs1AIarray) {
			if (gs1AIarray.hasOwnProperty(a)) {
				if (this.aiMaps.identifiers.includes(a)) {
					identifiers.push(a);
				}
				if (this.aiMaps.qualifiers.includes(a)) {
					qualifiers.push(a);
				}
				if (this.aiMaps.dataAttributes.includes(a)) {
					attributes.push(a);
				}
				if (this.aiMaps.fixedLength.includes(a)) {
					fixedLengthValues.push(a);
				}
				if (this.aiMaps.variableLength.includes(a)) {
					variableLengthValues.push(a);
				}

			}
		}

	

		if (brackets==true) {

			if (identifiers.length !== 1) {
				throw new Error("The associative array should contain exactly one primary identification key - it contained "+identifiers.length+" "+JSON.stringify(identifiers)+"; please check for a syntax error");
			} else {

				this.verifySyntax(identifiers[0],gs1AIarray[identifiers[0]]);
				this.verifyCheckDigit(identifiers[0],gs1AIarray[identifiers[0]]);

				elementStrings = elementStringsPush(elementStrings,"("+identifiers[0]+")",gs1AIarray[identifiers[0]],"");

				// append any valid found qualifiers for that primary identifier to the elementStrings array
			
				if (this.aiQualifiers.hasOwnProperty(identifiers[0])) {
					let qualifiersForPrimary=this.aiQualifiers[identifiers[0]];
				
					for (let qindex in qualifiersForPrimary) {
						if (qualifiers.indexOf(qualifiersForPrimary[qindex]) > -1) {
							elementStrings = elementStringsPush(elementStrings,"("+qualifiersForPrimary[qindex]+")",gs1AIarray[qualifiersForPrimary[qindex]],"");

						}
					}
				}

				// append any found attributes to the elementStrings array
				let sortedAttributes = attributes.sort();
				for (let a in sortedAttributes) {
					elementStrings = elementStringsPush(elementStrings, "("+attributes[a]+")",gs1AIarray[attributes[a]],"");
				}
			}
			
		} else {
		// if brackets=false, concatenate defined-length AIs first, then variable-length AIs
		// identify which AIs in gs1AIarray are defined fixed length

			let fixedLengthPrimaryIdentifier=[];
			let fixedLengthValuesOther=fixedLengthValues.slice(0);;
			
			
			for (let i in fixedLengthValuesOther) {
				if (identifiers.indexOf(fixedLengthValuesOther[i]) > -1) {
					fixedLengthPrimaryIdentifier.push(fixedLengthValuesOther[i]);
					fixedLengthValuesOther.splice(i,1);
				}
			}

			for (let i in fixedLengthPrimaryIdentifier) {
				elementStrings = elementStringsPush(elementStrings,fixedLengthPrimaryIdentifier[i],gs1AIarray[fixedLengthPrimaryIdentifier[i]],"");

			}			

			for (let i in fixedLengthValuesOther) {
				elementStrings = elementStringsPush(elementStrings,fixedLengthValuesOther[i],gs1AIarray[fixedLengthValuesOther[i]],"");
			}			

			for (let i in variableLengthValues) {
				let gs="";
				if (i<(variableLengthValues.length-1)) {
					gs=this.groupSeparator;
				}
				elementStrings = elementStringsPush(elementStrings,variableLengthValues[i],gs1AIarray[variableLengthValues[i]],gs);
			}			
					
		}
		
		return elementStrings.join("");
		
		
		function elementStringsPush(elementStrings,ai,value,gs) {
			let newvalue=value;
			// always pad the value of any GTIN [ AI (01) or (02) ] to 14 digits in element string representation
			if ((ai == "01") || (ai == "(01)") || (ai == "02") || (ai == "(02)")) {
				if (value.length==8) { newvalue = '000000'+value; }
				if (value.length==12) { newvalue = '00'+value; }
				if (value.length==13) { newvalue = '0'+value; }
			}
			elementStrings.push(ai+newvalue+gs);
			return elementStrings;
		}
		
	}


		

	// translate a string of concatenated GS1 element strings into a GS1 Digital Link URI
	gs1ElementStringsToGS1DigitalLink(elementString,useShortText,uriStem) {
			return this.buildGS1digitalLink(this.extractFromGS1elementStrings(elementString),useShortText,uriStem,{});
	}

	// translate a GS1 Digital Link URI into a string of concatenated GS1 element strings	
	gs1digitalLinkToGS1elementStrings(digitalLinkURI,brackets) {
		return this.buildGS1elementStrings(this.extractFromGS1digitalLink(digitalLinkURI).GS1,brackets);
	}

	// translate a GS1 Digital Link URI into a string of concatenated GS1 element strings	
	gs1compressedDigitalLinkToGS1elementStrings(digitalLinkURI,brackets) {
		return this.buildGS1elementStrings(this.extractFromCompressedGS1digitalLink(digitalLinkURI).GS1,brackets);
	}


	handleEncodings(enc,lengthBits,charstr,binstr) {
	// creates a binary string fragment that starts with a 3-digit encoding indicator, any lengthBits specified (empty string "" if not required for a fixed-length value) and then the actual value of charstr in binaryEncodingOfGS1AIKey
	// calls buildBinaryValue() when encoding the value in binary 
		switch (enc) {
			case 0: 
				// handle all-numeric encoding
				let binLength=this.numberOfValueBits(charstr.length);
				let binValue=parseInt(charstr).toString(2);
				binValue=this.padToLength(binValue,binLength);
				binstr+='000'+lengthBits+binValue;					
				break;

			case 1: 
				binstr+='001'+lengthBits+this.buildBinaryValue(charstr.toUpperCase(),4,this.hexAlphabet);
				break;

			case 2: 
				binstr+='010'+lengthBits+this.buildBinaryValue(charstr.toUpperCase(),4,this.hexAlphabet);
				break;

			case 3: 
				binstr+='011'+lengthBits+this.buildBinaryValue(charstr,6,this.safeBase64Alphabet);
				break;

			case 4: 
				binstr+='100'+lengthBits+this.buildBinaryValue(charstr,7,null);
				break;
		}	
		return binstr;
	}

	buildBinaryValue(charstr, n, alphabet) {
		// this method converts a string charstr into binary, using n bits per character and decoding from the supplied alphabet or from ASCII when n=7
		// this is almost the inverse method to buildString
		let binValue="";
		let binLength=n*charstr.length;
		for (let i=0; i<charstr.length; i++) {
			let index;
			if (n == 7) {
				// set index to the ASCII code for each character
				index=charstr.charAt(i).charCodeAt(0);
			} else {
				// otherwise find its position within the specified alphabet
				index=alphabet.indexOf(charstr.charAt(i));
			}
			// convert index from decimal to binary
			let binChar=index.toString(2);
			// left-pad to the appropriate number of bits to always reach n per character
			binChar=this.padToLength(binChar,n);
			// append the binary string with the encoding for each character in turn
			binValue+=binChar;
		}		
		return binValue;
	}


	handleDecodings(enc,binstr,cursor,gs1AIarray,key,numChars) {
	// starting with a specified encoding enc (in range 0-4), binary string binstr, binary string cursor position, key, number of characters to extract and associative array gs1AIarray to extend,
	// this method determines how many bits to extract (depending on the encoding), extracts those bits, advances the cursor and converts the extracted bits into a string value in the appropriate encoding, which is then inserted into the specified associative array	
	// the updated associative array and updated binary string cursor position are returned.
		
		let rv={};
		
		switch (enc) {
			case 0:
			// digits only at 3.32 bits per character
				let numBitsForValue=this.numberOfValueBits(numChars);
				let rbv=binstr.substr(cursor,numBitsForValue);
				cursor+=numBitsForValue;
				let s = parseInt(rbv,2).toString();
				gs1AIarray[key]=s;
				break;
		
			case 1:
			// lower case hexadecimal characters
				rv=buildString(numChars,this.hexAlphabet,cursor,4,binstr);
				cursor=rv.cursor;
				gs1AIarray[key]=rv.s.toLowerCase();
				break;

			case 2:
			// upper case hexadecimal characters
				rv=buildString(numChars,this.hexAlphabet,cursor,4,binstr);
				cursor=rv.cursor;
				gs1AIarray[key]=rv.s.toUpperCase();
				break;

			case 3:
			// URI safe base64 alphabet at 6 bits per character
				rv=buildString(numChars,this.safeBase64Alphabet,cursor,6,binstr);
				cursor=rv.cursor;
				gs1AIarray[key]=rv.s;					
				break;

			case 4 :
			// ASCII at 7 bits per character
				rv=buildString(numChars,null,cursor,7,binstr);
				cursor=rv.cursor;
				gs1AIarray[key]=rv.s;					
				break;

		}
		rv.gs1AIarray = gs1AIarray;
		rv.cursor=cursor;
		return rv;
		
		function buildString(numChars,alphabet,cursor,multiplier,binstr) {
		// this is almost the inverse function to buildBinaryValue
		
			let rv={};
			let s="";
			let numBitsForValue=multiplier*numChars;
			let rbv=binstr.substr(cursor,numBitsForValue);
			cursor+=numBitsForValue;
			for (let i=0; i<numChars; i++) {
				let index = parseInt(rbv.substr(multiplier*i,multiplier),2);
				// assume 6 bits encode an index 0-63 within the URI-safe base 64 alphabet
				if (multiplier == 7) {
						s+=String.fromCharCode(parseInt(index));
				} else {
					s+=alphabet.substr(index,1);
				}
			}
			rv.cursor=cursor;
			rv.s=s;
			return rv;
		}
		
	}


	
	decompressBinaryToGS1AIarray(binstr) {
		let totallength=binstr.length;
		// start at left-most bit position
		let cursor=0;

		// create empty hashtable
		let gs1AIarray={};

		// read h1,h2 and convert binary to hex
		while ((totallength-cursor) >8)  {
			
			let h1=this.binstrToHex(binstr.substr(cursor,4));
			let h2=this.binstrToHex(binstr.substr(4+cursor,4));
			let h3="";
			let h4="";
			let ai="";

			let h1h2=""+h1+h2;			
			cursor+=8;

			let d1=parseInt(h1,16);
			let d2=parseInt(h2,16);

			// check if h1h2 is within the range 00-99
			if ((d1>=0) && (d2>=0) && (d1<=9) && (d2<=9)) {

			// check if h1h2 has entry in table P
				if (this.tableP.hasOwnProperty(h1h2)) {
					let l=this.tableP[h1h2];

					if (l==2) { ai=h1h2; }
					if ((l==3) || (l==4)) { 
						h3=this.binstrToHex(binstr.substr(cursor,4));
						cursor+=4;
						let d3=parseInt(h3,16);
						if (d3>9) {
							throw new Error("GS1 Application Identifier keys should be all-numeric; "+h1h2+h3+" is not all-numeric");
						}
						ai=h1h2+h3;
					}
					if (l==4) { 
						let h4=this.binstrToHex(binstr.substr(cursor,4));
						cursor+=4;
						ai=h1h2+h3+h4;
						let d4=parseInt(h4,16);
						if (d4>9) {
							throw new Error("GS1 Application Identifier keys should be all-numeric; "+h1h2+h3+h4+" is not all-numeric");
						}
					}

					let tmp=this.decodeBinaryValue(ai,gs1AIarray,binstr,cursor);
					gs1AIarray=tmp.gs1AIarray;
					cursor=tmp.cursor;

				} else {
				
					throw new Error("Fail: Unsupported AI (reserved range) - no entry in tableP; h1h2="+h1h2);
				}


			} else {

				// h1h2 is outside 00-99, using some hex characters
				
				if (this.tableOpt.hasOwnProperty(h1h2)) {
					// we found an optimisation for h1h2

					let seq=this.tableOpt[h1h2];					
					for (let i in seq) {
						let ai=seq[i];
						let tmp=this.decodeBinaryValue(ai,gs1AIarray,binstr,cursor);
						gs1AIarray=tmp.gs1AIarray;
						cursor=tmp.cursor;
					}
				
				} else {

					if (h1=="F") {
						// handle decompression of non-GS1 key=value pairs
						let bitsIncludingF = binstr.substr(cursor-8,11);
						let keyLength=parseInt(binstr.substr(cursor-4,7),2);
						cursor+=3;  // 3 extra bits beyond h2

						let keyBits=binstr.substr(cursor,6*keyLength);
						cursor+=6*keyLength;
					
						let key="";
						for (let i=0; i<keyLength; i++) {
							let index = parseInt(keyBits.substr(6*i,6),2);
							// assume 6 bits encode an index 0-63 within the URI-safe base 64 alphabet
							key+=this.safeBase64Alphabet.substr(index,1);
						}
					
						let encBits=binstr.substr(cursor,3);
						cursor+=3;
						let enc=parseInt(encBits,2);
						let numChars=parseInt(binstr.substr(cursor,7),2);
						cursor+=7;
						let rv=this.handleDecodings(enc,binstr,cursor,gs1AIarray,key,numChars);


						gs1AIarray=rv.gs1AIarray;
						cursor=rv.cursor;
					
					} else {
						throw new Error("No optimisation defined for hex code hh="+h1h2);
					}


				}

			}


		}

		return gs1AIarray;
	}


	decodeBinaryValue(key,gs1AIarray,binstr,cursor) {
			let rv={};
			gs1AIarray[key]="";
	
			if (this.tableF.hasOwnProperty(key)) {
				for (let j in this.tableF[key]) {
					let tx=this.tableF[key][j];
						
					// handle fixed-length numeric component		
					if ((tx.hasOwnProperty('L')) && (tx.E == "N")) {
						// fixed-length, so no length indicator
						let b1=this.numberOfValueBits(tx.L);
						let rbv=binstr.substr(cursor,b1);
						cursor+=b1;
						let s=parseInt(rbv,2).toString();
						s=this.padToLength(s,tx.L);
						gs1AIarray[key]+=""+s;
					}

					// handle variable-length numeric component		
					if ((tx.hasOwnProperty('M')) && (tx.E == "N")) {
						let v2=this.numberOfLengthBits(tx.M);				
						let lengthBits=binstr.substr(cursor,v2);
						cursor+=v2;
						let numDigits=parseInt(lengthBits,2);
						let numBitsForValue=this.numberOfValueBits(numDigits); 
						let rbv=binstr.substr(cursor,numBitsForValue);
						cursor+=numBitsForValue;
						let s=parseInt(rbv,2).toString();
						if (numDigits==0) { s=""; }

						gs1AIarray[key]+=""+s;				
					}
			
					// handle fixed-length alphanumeric component		
					if ((tx.hasOwnProperty('L')) && (tx.E =="X")) {
						let encBits=binstr.substr(cursor,3); 
						cursor+=3; 			
						let enc=parseInt(encBits,2);
						let numChars=tx.L;
						let rvd=this.handleDecodings(enc,binstr,cursor,gs1AIarray,key,numChars);
						gs1AIarray=rvd.gs1AIarray;
						cursor=rvd.cursor;
					}
						
					// handle variable-length alphanumeric component	
					if ((tx.hasOwnProperty('M')) && (tx.E =="X")) {
						let encBits=binstr.substr(cursor,3); 
						cursor+=3; 			
						let v3=this.numberOfLengthBits(tx.M);
						let lengthBits=binstr.substr(cursor,v3);
						cursor+=v3;
						let numChars=parseInt(lengthBits,2);
						let enc=parseInt(encBits,2);
						let rvd=this.handleDecodings(enc,binstr,cursor,gs1AIarray,key,numChars);
						gs1AIarray=rvd.gs1AIarray;
						cursor=rvd.cursor;
					}
					
				}
			}
		rv.gs1AIarray = gs1AIarray;
		rv.cursor = cursor;
		return rv;	
	}	
	

	compressGS1AIarrayToBinary(gs1AIarray,useOptimisations,nonGS1keyvaluePairs) {
		let binstr="";
		let cursor;
		let value;		
		// identify candidate optimisations from tableOpt
		let akeysa = Object.keys(gs1AIarray).sort();
		let optimisations=[];

		if (useOptimisations) {

			let akeys = JSON.stringify(akeysa);

			let candidatesFromTableOpt;

			do {
				candidatesFromTableOpt=findCandidatesFromTableOpt(akeysa,this.tableOpt);
		
				// pick candidatesFromTableOpt that can save the highest number of AI key characters
		
				let bestCandidate=findBestOptimisationCandidate(candidatesFromTableOpt);

				let v=this.tableOpt[bestCandidate];
		
				if (bestCandidate !== "") {
					akeysa=removeOptimisedKeysFromAIlist(akeysa,this.tableOpt[bestCandidate]);
					optimisations.push(bestCandidate);
				}

				candidatesFromTableOpt=findCandidatesFromTableOpt(akeysa,this.tableOpt);

			} while (Object.keys(candidatesFromTableOpt).length > 0)

		
		}


		// encode binary string for any optimised values from tableOpt first
		for (let i in optimisations) {
			let key=optimisations[i];
			binstr+=this.binaryEncodingOfGS1AIKey(key);
			let optArray=this.tableOpt[key];
			for (let i in optArray) {
				let k=optArray[i];
				binstr+=this.binaryEncodingOfValue(gs1AIarray,k);
			}
		}


		// then append this further by encoding binary string values for any other AI key=value pairs for which no optimisations were found
		for (let i in akeysa) {
		let key=akeysa[i];
			if (gs1AIarray.hasOwnProperty(key)) {
				binstr+=this.binaryEncodingOfGS1AIKey(key);
				binstr+=this.binaryEncodingOfValue(gs1AIarray,key);			
			}
		}

		// then if any non-GS1 key=value pairs were also to be compressed, also compress those and append to the binary string
		// note that hex value F ('1111') is used as a flag (as a reserved value of h1) to indicate that what follows is a compressed binary representation of a non-GS1 key=value pair
		// we permit key lengths up to 128 characters only from the URI-safe base64 alphabet (A-Z a-z 0-9 hyphen and underscore)
		if (Object.keys(nonGS1keyvaluePairs).length > 0) {
			for (let key in nonGS1keyvaluePairs) {
				let lengthBits = (key.length).toString(2);
				lengthBits=this.padToLength(lengthBits,7);
				binstr+="1111"; // 'F' (flag for foreign keys)
				binstr+=lengthBits;
				let binKey="";
				for (let i=0; i<key.length; i++) {
					let index=this.safeBase64Alphabet.indexOf(key.charAt(i));
						let binChar=index.toString(2);
						binChar=this.padToLength(binChar,6);
						binKey+=binChar;
				}
				binstr+=binKey; // key encoded in binary using 6-bit per character
				
				// after encoding the binary key, encode the corresponding value, using optimisations where possible
				binstr+=this.binaryEncodingOfNonGS1Value(nonGS1keyvaluePairs[key]);
			}
		}

		return binstr;
		
		
		function findCandidatesFromTableOpt(akeysa,tableOpt) {	
			let candidatesFromTableOpt={};
			for (let i in tableOpt) {
				let a=tableOpt[i];
				let b=true;
				for (let j in a) {
					if (akeysa.indexOf(a[j]) == -1) {
						b=false;
					}
				} 
				if (b) {
					candidatesFromTableOpt[i]=tableOpt[i].join("").length;
				}
			}
			return candidatesFromTableOpt;
		}
		
		function findBestOptimisationCandidate(candidatesFromTableOpt) {
			let maxkey="";
			let max=0;		
			for (let i in candidatesFromTableOpt) {
				if (candidatesFromTableOpt[i]>max) {
					maxkey=i;
					max=candidatesFromTableOpt[i];
				}
			}
			return maxkey;
		}
		
		function removeOptimisedKeysFromAIlist(akeysa,v) {
			for (let i in v) {
				let ind=akeysa.indexOf(v[i]);
				if (ind > -1) {
					akeysa.splice(ind, 1);
				}
			}
			return akeysa;
		}

	}

	binaryEncodingOfGS1AIKey(key) {
				// construct binary encoding of AI key as sequence of 4-bit digits
				// this is now modified to also support hex values of key
				let binAI="";
				for (let i=0; i<key.length; i++) {
					binAI+=this.padToLength(parseInt(key.charAt(i),16).toString(2),4);
				}
		return binAI;
	}

	binaryEncodingOfValue(gs1AIarray,key) {
		let binstr="";
		if (this.tableF.hasOwnProperty(key)) {
			let cursor=0;
			let value=gs1AIarray[key];

			for (let j in this.tableF[key]) {
				let tx = this.tableF[key][j];


				if ((tx.hasOwnProperty("L")) && (tx.E =="N")) {
					// handle fixed-length numeric component
					let charstr=value.substr(cursor,tx.L);
					cursor+=parseInt(tx.L);
					let binValue=this.padToLength(parseInt(charstr).toString(2),this.numberOfValueBits(tx.L));
					binstr+=binValue;
				}

				if ((tx.hasOwnProperty("M")) && (tx.E =="N")) {
					// handle variable-length numeric component
					let charstr=value.substr(cursor);
					cursor+=charstr.length;
					let lengthBits=this.padToLength((charstr.length).toString(2),this.numberOfLengthBits(tx.M));
					let binValue=this.padToLength(parseInt(charstr).toString(2),this.numberOfValueBits(charstr.length));
					binstr+=lengthBits+binValue;
				}

				if ((tx.hasOwnProperty("L")) && (tx.E == "X")) {
					// handle fixeed-length alphanumeric component
					let charstr=value.substr(cursor,tx.L);
					cursor+=parseInt(tx.L);
					let enc=this.determineEncoding(charstr);
					let lengthBits="";
					binstr+=this.handleEncodings(enc,lengthBits,charstr,binstr);
				}

				if ((tx.hasOwnProperty("M")) && (tx.E == "X")) {
					// handle variable-length alphanumeric component
					let charstr=value.substr(cursor);
					cursor+=charstr.length;
					let lengthBits=this.padToLength((charstr.length).toString(2),this.numberOfLengthBits(tx.M));
					let enc=this.determineEncoding(charstr);
					binstr+=this.handleEncodings(enc,lengthBits,charstr,binstr);
				}
			}
		}
		return binstr;
	}

	determineEncoding(charstr) {								
		let enc=4; 
		if (this.regexSafe64.test(charstr)) { enc=3; } 
		if (this.regexHexLower.test(charstr)) { enc=1; } 
		if (this.regexHexUpper.test(charstr)) { enc=2; } 
		if (this.regexAllNum.test(charstr)) { enc=0; } 
		return enc;
	}

	binaryEncodingOfNonGS1Value(charstr) {
		let lengthBits=(charstr.length).toString(2);
		lengthBits=this.padToLength(lengthBits,7);
		let enc=this.determineEncoding(charstr);
		let binstr=this.handleEncodings(enc,lengthBits,charstr,"");	
		return binstr;
	}

	buildCompressedGS1digitalLink(gs1AIarray,useShortText,uriStem,useOptimisations,compressOtherKeyValuePairs,nonGS1keyvaluePairs) {

		let identifiers=[];
		let qualifiers=[];
		let attributes=[];
		let fixedLengthValues=[];
		let variableLengthValues=[];
	
		let valid=true;
		let path="";
		let queryStringArray=[];
		let queryString="";
		let webURI="";
		let canonicalStem="https://id.gs1.org";
		let rv={};

		if (!(compressOtherKeyValuePairs)) {
			// do pass-through of query string params
			let akv=[];
			for (let k in nonGS1keyvaluePairs) {
				akv.push(k+"="+nonGS1keyvaluePairs[k]);
			}
			if (akv.length > 0) {
				queryString="?"+akv.join("&");			
			}
		}
		
		// Need to remove unwanted trailing slash
		if ((uriStem !== undefined) && (uriStem !== null) && (uriStem !== "") && (uriStem.endsWith("/"))) {
			uriStem=uriStem.substr(0,uriStem.length);				
		}

		path="/"+this.bin2base64(this.compressGS1AIarrayToBinary(gs1AIarray,useOptimisations,(compressOtherKeyValuePairs ? nonGS1keyvaluePairs : {})));
		
				if ((uriStem == null) || (uriStem == "")) {
					// prepare a canonical Web URI
					webURI=canonicalStem+path+queryString;	
				} else {
					webURI=uriStem+path+queryString;
				}

		return webURI;	
	}


	decompressGS1DigitalLink(compressedDigitalLinkURI,useShortText,uriStem) {
		let extracted = this.extractFromCompressedGS1digitalLink(compressedDigitalLinkURI);
		let gs1AIarray = extracted.GS1;
		let otherArray = extracted.other;
		let uncompressedDL = this.buildGS1digitalLink(gs1AIarray,useShortText,uriStem,otherArray);	
		return uncompressedDL;
	}

	decompressGS1DigitalLinkToStructuredArray(compressedDigitalLinkURI) {
		let extracted = this.extractFromCompressedGS1digitalLink(compressedDigitalLinkURI);
		let gs1AIarray = extracted.GS1;
		let otherArray = extracted.other;
		let structuredArray = this.buildStructuredArray(gs1AIarray,otherArray);	
		return structuredArray;
	}


	compressGS1DigitalLink(digitalLinkURI,useShortText,uriStem,uncompressedPrimary,useOptimisations,compressOtherKeyValuePairs) {
		// extract query string
		let firstQuestionMark = digitalLinkURI.indexOf("?");
		let queryString="";
		let nonGS1keyvaluePairs={};
		if (firstQuestionMark > -1) {
			queryString = digitalLinkURI.substr(1+firstQuestionMark);
		}
		if (queryString !== "") {
			// if semicolon was used as delimiter between key=value pairs, replace with ampersand as delimiter
			queryString = queryString.replace(new RegExp(";", 'g'),"&");

			let firstFragment = queryString.indexOf("#");
			if (firstFragment > -1) {
				queryString = queryString.substring(0,firstFragment);
			}
			
			let pairs = queryString.split("&");
			for (let i=0; i<pairs.length; i++) {
				let p = pairs[i].split("=");
				// if the key is not numeric AND is not a shortcode such as exp or expdt, then add to the nonGS1keyvalueePairs
				if ((p[0] !== null) && (p[1] !== null) && (!(this.regexAllNum.test(p[0])) && (!(this.shortCodeToNumeric.hasOwnProperty(p[0]))))) {
					nonGS1keyvaluePairs[p[0]]=this.percentDecode(p[1]);
				}
			}
		}

		let gs1AIarray=this.extractFromGS1digitalLink(digitalLinkURI).GS1;
		let compressedDL=this.buildCompressedGS1digitalLink(gs1AIarray,useShortText,uriStem,useOptimisations,compressOtherKeyValuePairs,nonGS1keyvaluePairs);
		return compressedDL;
	}


	gs1ElementStringsToCompressedGS1DigitalLink(elementString,useShortText,uriStem,uncompressedPrimary,useOptimisations) {
			let gs1AIarray=this.extractFromGS1elementStrings(elementString);
			let separated=this.separateIDnonID(gs1AIarray);
		if (uncompressedPrimary) {
			return this.buildGS1digitalLink(separated.ID,useShortText,uriStem,{})+"/"+this.bin2base64(this.compressGS1AIarrayToBinary(separated.nonID,useOptimisations,{}));
		} else {
			return this.buildCompressedGS1digitalLink(this.extractFromGS1elementStrings(elementString),useShortText,uriStem,useOptimisations,false,{});
		}
	}
	
	separateIDnonID(gs1AIarray) {
		let rv={};
		let idArray={};
		let nonIDarray={};
		let keys=Object.keys(gs1AIarray);
		for (let i in keys) {
			if (gs1AIarray.hasOwnProperty(keys[i])) {
				if (this.aiMaps.identifiers.indexOf(keys[i]) > -1) {
					idArray[keys[i]] = gs1AIarray[keys[i]];
				} else {
					nonIDarray[keys[i]] = gs1AIarray[keys[i]];
				}
			}
		}
		rv.ID=idArray;
		rv.nonID=nonIDarray;
		return rv;
	}

}

if (typeof(module) != "undefined") {
module.exports = GS1DigitalLinkToolkit;
}