Bugreporter added a comment. |
Yes unique entity IDs should be prefixes or full URLs.
However (e.g.) two wikis both using Qids, one as https://www.wikidata.org/wiki/Q123, the other as https://www.example.com/wiki/Q123
You can differentiate them via (e.g.) wikidata:Q123 and (local) Q123, or full URL, but end users (who does not necessary know how federation work) may be confused.
Therefore make prefix customizable is more user-friendly, even if the prefix is not unique. i.e. you can not prevent other foreign repositories use different prefixes, but you may (though not must of course) make your local prefix different from all foreign ones, probably via prefixes with more than one letters (e.g. OSM1234 or ON123 (node)/OW456 (way)/OR789 (relation)).
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