A catalogue claiming conformance to this part of ISO 22745 shall:
satisfy the requirements of ISO 8000-110, "free encoding" conformance class;
satisfy the modifications to the UML model given in Clauses 5 and 6.
be valid XML, as defined in the W3C XML recommendation, and shall comply with the catalogue XML schema given in Annex B;
have as its root element the catalogue element defined in the catalogue schema given in Annex B;
link, for all externally-defined concepts and metadata, to entries in an OTD that conforms to ISO 22745-1.