| daniel added a comment. |
In T121274#3614183, @Lucas_Werkmeister_WMDE wrote:Copying Daniel’s comment from Gerrit:
The normalized value of an identifier is not the same as its URI expansion. E.g. ISBNs have a normalized form and a URN, they are not the same.
I think this means that for an ISBN-10 052122151x, the normalized form is 0-521-22151-X while the URN/URI is urn:isbn:0-521-22151-X. But do we have plans to do such external identifier normalization in Wikibase itself? I was under the impression that we expect them to be saved in normalized form in Wikidata itself (for instance, many “external identifier” properties have format constraints to ensure this).
Yea, ISBN is probably not a good example, for two reasons: 1) we usually do syntactic normalization when processing input already, so no need for a separate normalized value in RDF and 2) the normalization rule for ISBNs would be bound to the property, not the data type. We don't support this at the moment, it's on the "would be nice" list.
So, forget about ISBNs. My point was: expanding IDs to resource references is not really the same thing as normalizing values. Conflating them makes my semantic pinky tingle. For one thing, it feels like normalized values should keep the same type. This is not the case when expanding external identifiers.
But what I'm expressing here is a feeling of unease, not a blocker or requirement. I'm not an expert on RDF modeling. I wish we had one around ;)
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