External identifiers (e.g. gnd, wd)

[ncarboni]

Currently the external identifiers (e.g. https://www.wikidata.org/wiki/Q124151) are recorded as E42 identifiers and their value is embedded in the URI of the E42. We need to chage and give it a proper structure.

Several options were analysed, specifically:

• use skos:exactMatch. Problem: it requires skos:concept
• use owl:sameAs . It should not be used (however it is used: see this example)
• use P1 -> E42 as currently done. This is not a solution because it classify the URI of the person in a KB as identifier, flattening the two together. The URI need to identify the person.
• use L54 same as from CRMdig.

The use of "L54 is same-as" is the one that appear to be the correct one and it does leave several degree of freedom without renouncing to CRM.

The mapping of external identifier should then follow the below schema:

Example:

<https://resource.swissartresearch.net/person/68BB1C99-3C70-4873-BF46-912138444268> a crm:E21_Person ;
    crmdig:L54_same_as <https://www.wikidata.org/wiki/Q103586> .

<https://resource.swissartresearch.net/event/68BB1C99-3C70-4873-BF46-912138444268> a crm:E13_Attribute_assignment ;
    crm:P14_carried_out_by <https://resource.swissartresearch.net/group/wikidata> ;
    crm:P140_assigned_attribute_to <https://www.wikidata.org/wiki/Q103586> .

On purpose we do not specify what class https://www.wikidata.org/wiki/Q103586 belongs to.

From a quick check this need to be changed in

• Places: plIdentifier_tgn_uri
• Person:
  • _99_actor_nameclass_identifierGND_identifier
  • _99_actor_nameclass_identifierSIKART_identifier
  • _99_actor_nameclass_identifierULAN_identifier
  • _99_actor_nameclass_identifierWikidata_identifier
  • _99_actor_nameclass_identifierWikipedia_identifier
• Group
  • _99_actor_nameclass_identifierGND_identifier
  • _99_actor_nameclass_identifierSIKART_identifier
  • _99_actor_nameclass_identifierULAN_identifier
  • _99_actor_nameclass_identifierWikidata_identifier
  • _99_actor_nameclass_identifierWikipedia_identifier

[ncarboni]

No solution has been achieved by other modelling group. I would suggest to proceed with this solution. To check with smartUP

[ymark]

The "L54 is same-as" solution has been adopted for the external identifiers of places. We've made the following modifications (because of technical limitations):

• Made external URLs (e.g. TGN ones) instances of the class E53_Place. We can change it to something more generic if needed (e.g. E1, rdf:Resource)
• Used P140i instead of P140

We've made the appropriate updates in RDS platform fields as well.

We've re-transformed and uploaded (some) places in the platform.

[ncarboni]

@ymark to double check