#NEWLINE# def variableRefs( self , progs = [ ] , varRefSet = None ) : #NEWLINE# #INDENT# return super ( ModelConceptRelationshipDefinitionNode , self ) . variableRefs ( [ p for p in ( self . arcroleExpressionProg , self . linkQnameExpressionProg , self . arcQnameExpressionProg ) if p ] , varRefSet )