SDMN — ItemKind is in the Wrong Location

itemKind is meant to define the nature of the DataItem.

In the current version, itemKind is erroneously an attribute of the ItemDefinition, it should be an attribute of the DataItem.

The itemKind should be moved as an attribute of the DataItem

Move ItemKind to DataItem and Adjust Specification as Necessary

Here is a brief description of the changes:
In the Metamodel:

• The itemKind attribute was moved from the ItemDefinition element to the DataItem element
• The multiplicityKind attribute was removed from the ItemDefinition element. It is already in the DataItem element and is not needed in ItemDefinition.
• The attached figures were updated as a result of the metamodel changes

In the Specification:

• The ItemKind section was moved from the ItemDefinition chapter to the DataItem Chapter
  • Some text changes in the section were necessary as a result of the move (e.g., replacing ItemDefinition with DataItem, etc).
• The ItemKind named "DataType" was renamed to "Information" to match what is in BPMN
• The MultiplicityKind Values table mentions ItemDefinition. These mentions were removed since they no longer apply.
• Chapter 11 mapping definitions were updated