context XDSSDDocument
inv: (not self.custodian.oclIsUndefined()) and 
(not self.custodian.assignedCustodian.oclIsUndefined()) and
(not self.custodian.assignedCustodian.representedCustodianOrganization.oclIsUndefined()) and
(not self.custodian.assignedCustodian.representedCustodianOrganization.addr.oclIsUndefined())