TypeDefinition :: isEnumeration - Is data type an enumeration
The function returns true, when the type definition refers to an enumerated data type (enumeration). The function can be called in order to check, whether the data type is an enumeration before calling functions requesting an enumeration.
When the type definition is not valid or does not refer to an enumeration, the function returns false.
Return value: Success ( bool )
The value is true when the function was executed successfully. Otherwise the value is set to false.