Implement casting/mapping towards datatype `xsd:dateTime` and `xsd:date`.#1825

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realHannes wants to merge 6 commits intoad-freiburg:masterfrom realHannes:function-value-map-xsd-date

+264-58

Commits on Feb 20, 2025

implement built-in function call/xsd:datatype() conversion to xsd:dateTime/date
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refine comments + the required value-getter
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Commits on Feb 21, 2025

review changes (1)
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Commits on Feb 22, 2025

Commits on Feb 27, 2025

changes for review (2)
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