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Subject: Re: SV: SV: SV: SV: FW: [plcs-dex] Unique constraints -> identification and versioning
On Wednesday 20 December 2006 11:38, mats.nilsson@fmv.se wrote: > > Another comment (which is more of a new topic) on you example, > > > > > A SerialNumber is a unique number that is one of a series assigned for > > identification which varies from its successor or predecessor by a fixed > > discrete integer value. > > I think we should try to avoid using the term(s) of the class/concept we > try to define, within the defining text. I used this format because it's what SC4 requires for defining entity types in AP239 so I thought it would be familiar. If you want to propose a different convention to the PLCS TC and get them to approve it, have fun ... that's too much effort for too little gain for me:-) Note that the format you used is how dictionaries define terms. The convention of a dictionary is typically to specify a phrase that could be substituted in a sentence instead of the defined term. However, in an RD you are not defining a natural language, you're specifying the semantics of a class (i.e. you're specifying its membership). That seems closer to me to the SC4 intent than to writing a dictionary. Cheers, David
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