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

Richard Light richard at light.demon.co.uk
Thu Jun 13 18:54:10 EEST 2019


I strongly support your view that we should not re-use identifiers.  The only argument I could give for this practice is the desire for a nice neat sequence of identifiers: and we have already scuppered that aspiration by deprecating previously-published classes and properties (thereby causing gaps to appear). So, please, don't do it!



On 13/06/2019 16:29, Vincent Alamercery wrote:
Dear all,

during the SIG meeting in Paris, we added the new property "P177 assigned property type" (see http://www.cidoc-crm.org/sites/default/files/CIDOC%20CRM_v6.2.6_Definition_esIP.pdf).

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 http://www.cidoc-crm.org/sites/default/files/CIDOC%20-%20CRM_v6.2.6_%20Amendments.pdf)

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...: http://www.cidoc-crm.org/Issue/ID-345-properties-having-domain-or-range-deprecated-classes
  *   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<mailto:vincent.alamercery at ens-lyon.fr>


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Richard Light
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