Issue 10846: Annex D.4 sets (odm-rtf) Source: NIST (Dr. Conrad Bock, conrad.bock(at)nist.gov) Nature: Revision Severity: Significant Summary: Annex D.4 sets. Annex D.4, under Figure D.4 should have another constraint that prevents two instances of NAryProperty from having the same values for the properties of the Nary. Otherwise, it could represent a bag of property values, which OWL properties cannot Resolution: Closed to the resolution of issue 18836, delete Annex D, "Extending the ODM" from the specification Revised Text: Actions taken: March 30, 2007: received issue April 25, 2014: closed issue Discussion: The RTF agrees with the issue raised against the recommended representation of n-ary relations. There are a number of ways of modeling n-ary relations in OWL, including reification of the relationships as classes, as described in http://www.w3.org/TR/swbp-n-aryRelations/ and as partially described in the Annex. These have a corresponding patterns in ontologies represented using the ODM metamodels, but would not require an extension to the metamodel itself, necessarily. The representation described in Annex D would indeed require an additional constraint if implemented, but using the methods described for extending the ODM is not recommended. Our recommendation after reviewing this issue and issue 10846 is to remove Annex D altogether End of Annotations:===== m: webmaster@omg.org Date: 30 Mar 2007 00:49:04 -0500 To: Subject: Issue/Bug Report -------------------------------------------------------------------------------- Name: Conrad Bock Company: NIST mailFrom: conrad.bock@nist.giv Notification: No Specification: Ontology Definition Metamodel Section: Annex D FormalNumber: ptc/06-10-11 Version: RevisionDate: Page: Nature: Revision Severity: Significant HTTP User Agent: Mozilla/5.0 (Windows; U; Windows NT 5.1; en-US; rv:1.7.2) Gecko/20040804 Netscape/7.2 (ax) Description Annex D.4 sets. Annex D.4, under Figure D.4 should have another constraint that prevents two instances of NAryProperty from having the same values for the properties of the Nary. Otherwise, it could represent a bag of property values, which OWL properties cannot.