Am 19.10.21 um 09:46 schrieb Fons Adriaensen:
Instead of e.g.       http://lv2plug.in/ns/lv2core#ControlPort
you can just write    lv2:ControlPort
That I understand. But:

1. The logic that allows this is hard coded in the LV2 host,
   it is not the result of 'including' the @prefix. Checking
   that the @prefix is present does not mean that whatever
   is hard coded corresponds to what the @prefix is supposed
   to imply. This is what I mean when saying that all this
   just provides 'an illusion of conformity'.


@prefix is just turtle language. It's nearly the first you read about in the introduction for RDF 1.1 Turtle

https://www.w3.org/TR/turtle/#sec-intro