self.slot->select(sl : SlotType1 |
	(not sl.name.oclIsUndefined()) and 
	sl.name='urn:ihe:iti:xds:2013:referenceIdList'
)->forAll(sl : SlotType1 |
	sl.valueList.oclIsUndefined() or 
	sl.valueList.value->forAll(val : String |
		self.isCXi(val)
	)
)