self.slot->forAll(sl : SlotType1 | 
	sl.name.oclIsUndefined() or 
	(sl.name = 'authorInstitution') or 
	(sl.name = 'authorPerson') or 
	(sl.name = 'authorRole') or 
	(sl.name = 'authorSpecialty') or 
	(sl.name = 'authorTelecommunication')
)