[Crm-sig] Reuse identifiers of obsolete entities never published

Vincent Alamercery vincent.alamercery at ens-lyon.fr
Thu Jun 13 18:29:38 EEST 2019

Dear all,

during the SIG meeting in Paris, we added the new property "P177 
assigned property type" (see 

This property reuses the already given identifier of the property "P177 
ends within" which has been deprecated without ever belonging to a 
published version (see 
http://www.cidoc-crm.org/Property/p177-ends-within/version-6.2.2 and 

We had a little discussion on whether or not to reuse this identifier 
already given. Maybe I'm picky but I'm not really comfortable with this 
practice. I suggest never to reuse an identifier for the following 
non-exhaustive reasons:

  * Even it's highly not recommended to use a draft version of CIDOC
    CRM, an entity exists from the moment it appears on a public
    document. It could then be potentially used by anyone. In a given
    namespace, an identifier must have to be unique.
  * For documentation reason, it's easier to have unique identifiers too
    to avoid speaking of "the old P177" or "the new P177". For instance,
    in the issue #345, how to know of which P177 property we are talking
    about? Think "the new P177" could be deprecated too one day...:
  * Numbers are infinite, we don't need to save them. ;-)

Best regards,


Vincent Alamercery
Pôle histoire numérique

École normale supérieure de Lyon
15 parvis René Descartes
BP 7000
69342 Lyon cedex 07

Tel : +33 (0)4 37 37 60 73
vincent.alamercery at ens-lyon.fr


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