afs commented on issue #2987:
URL: https://github.com/apache/jena/issues/2987#issuecomment-2633318489
Hi @ziodave
A vocabulary does not have to registered with the Jena core system to be
used.
The files in "vocabularies/" aren't special - the code does not react to
their presence and a constants file can be in any java package,
Mostly, they are W3C related or Jena-specific (W3C vocabaularies are usually
quite stable).
The files provide convenience constants in Java, but they don't contain java
for any domain/range declarations or any labels, or (as in the GS1 case) the
`owl:sameAs` declarations.
To use in data, simply use the URIs, with or without a prefix declaration.
No Jena setup necessary.
```ttl
PREFIX gs1: <https://ref.gs1.org/voc/>
```
To use in code, a `schemagen` translation of GS1 can be placed in any java
package including your application.
The GS1 vocabulary changed in 2025-01 and [changed several
times](https://ref.gs1.org/voc/data/archive) in 2024. A copy in Jena is going
to become out-of-date quite quickly. (The schema.org copy in `vocabularies/` is
over 4 years out of date.)
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