Constraint Descriptor : constraint_datatypes_nullFlavor (type: ERROR, kind: )

Constraint : constraint_datatypes_nullFlavor

Constraint Name
constraint_datatypes_nullFlavor (type: ERROR, kind: )
Constraint Class
URL
Package
datatypes
Description
URL must be nullFlavor, or it must have value attribute (from the schema datatypes-base.xsd, rule rule-URL)
OCL 
(not self.nullFlavor.oclIsUndefined()) xor (not self.value.oclIsUndefined())