An instance of IdentitySet is a collection of non-ordered objects or intrinsics. Duplicates are not allowed in an IdentitySet.
An IdentitySet is more specific than a ValueSet as it compares object references instead of values. For example, if you asked it to find the element myElement it would only find it if the IdentitySet contained the same object reference as myElement.
See class ValueSet.
Include this entry in the Class-Control paragraph of any program using this class.
IdentitySet is class "iset"