My understanding is: yes there can be such an instance. For instance An Actor can be present at a Measuring Event without actual performing it. Rgds SdS
Stephen Stead Tel +44 20 8668 3075 Mob +44 7802 755 013 E-mail [email protected] -----Original Message----- From: [email protected] [mailto:[email protected]] On Behalf Of Christian-Emil Ore Sent: 11 June 2007 13:48 To: crm-sig Subject: [Crm-sig] subproperty - superproperty Dear all, I may well be blind, but I cannot find the following specified in the crm-definition: Assume we have four class (could be two) Ei, Ej, Ek, El and two properties Pa, Pb Ek is a sub class of Ei El is a sub class of Ej Pa: Ei <-> Ej Pb: Ek <-> El which can be illustrated by the diagram Pa Ei <----> Ej | | | | | | | | | Ek <----> El Pb It is clear that each instance of a Pb will be a Pa when seen as a property on the superclass level. That is ordinary object orientedness and well documented in the crm standard. Since Ek and El are subclasses of Ei and Ej, the properties between Ei and Ej, that is, Pa will also be a property between Ek and El. However, can there exist an instance of Pa:Ek <--> El that is not an instance of Pb? Regards, Christian-Emil _______________________________________________ Crm-sig mailing list [email protected] http://lists.ics.forth.gr/mailman/listinfo/crm-sig
