Added support for a node item-based document.

Author: david-waltermire

core/src/main/java/gov/nist/secauto/metaschema/core/metapath/atomic/IAtomicOrUnionType.java

@@ -135,6 +135,16 @@ default I cast(@NonNull ISequence<?> sequence) {
     return item == null ? null : cast(item);
   }
 
+  /**
+   * Construct a new instance of this type using the provided value.
+   *
+   * @param value
+   *          the "wrapped" value of the type
+   * @return the new item
+   */
+  @NonNull
+  I newItem(@NonNull Object value);
+
   /**
    * A callback used to perform a casting operation.
    *
@@ -153,14 +163,4 @@ interface ICastExecutor<ITEM extends IAnyAtomicItem> {
     @NonNull
     ITEM cast(@NonNull IAnyAtomicItem item);
   }
-
-  /**
-   * Construct a new instance of this type using the provided value.
-   *
-   * @param value
-   *          the "wrapped" value of the type
-   * @return the new item
-   */
-  @NonNull
-  I newItem(@NonNull Object value);
 }

core/src/main/java/gov/nist/secauto/metaschema/core/metapath/atomic/IAtomicValuedItem.java

@@ -12,5 +12,5 @@
  * associated {@link IAnyAtomicItem} value.
  */
 public interface IAtomicValuedItem extends IItem {
-  // no additional methods
+  // no new methods
 }