absolute URL interpreted as relative URL when there's a @prefix equal to @base

[VladimirAlexiev]

@base         <https://ontotext.com/knowledge-graph/>.
@prefix OTKG: <https://ontotext.com/knowledge-graph/>.

<researchProject/(acronym)> a s:ResearchProject;
  s:sameAs         <(wikidata)>.

This is rendered as the CURIE OTKG:(wikidata), i.e. the field (wikidata) is interpreted as a URL relative to @base.

This makes sense for templated URLs like <researchProject/(acronym)> because the start it not a URL scheme like http:.
But for a URL that consists of a field alone, it's reasonable to assume that will be an absolute URL.

It's the RDF parser that decides that (wikidata) is a relative URL. How to fool it into not using @base?

• I could fake it as https://(wikidata) but that's ugly as hell: how could I know that's the right URL scheme?
• If I fake it as /(wikidata), that would use the host from @base, and <https://ontotext.com/(wikidata)> is even worse.

I think it's the safest to EXCLUDE the @prefix that is equal to @base.

(The reason I used it is because GraphDB remembers prefixes as namespaces, but does not remember base.
So OTKG: is used to shorten URLs when displaying resources.)

TODO: document in rdfpuml page