Kaz, Project:actualStartDate occurrence should be specified as Zero-or-one. In RDF, the normal way to indicate a "null" value is to omit the property. There is usually no special "null" value. _________________________________________________________ Arthur Ryman Chief Data Officer SWG Rational 905.413.3077 (phone) 416.939.5063 (cell) IBM InterConnect 2015 From: Kazuhiro Funakoshi <
k-f@bk.jp.nec.com> To: Arthur Ryman/Toronto/IBM@IBMCA Cc: "oslc-promcode@lists.oasis-open.org" <
oslc-promcode@lists.oasis-open.org> Date: 12/23/2014 08:42 PM Subject: [oslc-promcode] Question on oslc:occurs Sent by: <
oslc-promcode@lists.oasis-open.org> Arthur, We had a local briefing on last Friday. During the session, we found a new question about resource shape definition. > 6.18 oslc:occurs Property > oslc:occurs is used to specify the number of times that the defined property may occur. The value of this property MUST be one of the following individuals: In my understanding, this oslc:occurs does not specifies the value of property whether null-able but number of the property. Therefore, in our shape document, Project:actualStartDate should be oslc:exactly-one but null-able, since we think it is mandatory but still undecided at the beginning of the project. Is it correct? Best regards, Kaz