Dear George, I believe you are right that nowadays most SP5 will be D1 and have been created in a digital process, lots of times as GPS measurements or derived from digital sources. But it may have been created from analog measurements too, or measured out of a map. Making SP5 isA D1 would exclude these cases, wouldn`t it? I believe the main point is to be able to attach the provenance and creation process (an E65) of the SP5 to understand if it is sensible to be used in a specific context. Do you have a case, where you would need the SP5 to be a D1 by definition? Best, Gerald
From: Crm-sig <[email protected]> on behalf of "george. bruseker" <[email protected]> Date: Tuesday, 6. October 2020 at 14:49 To: crm-sig <[email protected]> Subject: [Crm-sig] Modelling Question: SP5 Geometric Place Expression and D1 Digital Object Dear all, Just a question here. SP5 Geometric Place Expression is to my understanding the class we would use to describe a line, polygon etc. that is created in an information system in order to express a declarative place SP6 that we are using to approximate a real place E53. I note that SP5 is a subclass of: E73 Information Object ,E47 Spatial Coordinates, Geometry , E94 Space Primitive I understand then that SP5 is both a geometric value and also an information object. My question is: can/should there be a harmonization between family models such that SP5 isA D1 Digital Object. I ask this because in actual practice I assume that most SP5 will arise out of a digital process and therefore, we may want to make this connection. Opinions / thoughts? Sincerely, George
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