Ah, I see, I was looking at your comment. We don't have a datatype/language selector but we could do something like: --select CURIE=@en and --select CURIE=^^xsd:string?

Then you could accomplish this with:

robot remove --input in.owl \
  --select "rdfs:label=@en" \
  --select complement \
  --select classes \
  --include-term rdfs:label \
  --trim false \
  --axioms annotation \
  --output out.owl

Note that --include-term is coming from #570. Ideally, we would merge this first to avoid any merge conflicts...

This selects all entities labeled with an @en language tag, then gets the complement of that (so everything without an @en label). Then, it selects only the classes from that set - so you're left with all classes that do not have an @en label. You include rdfs:label in the final set of objects.

--trim false means that only axioms containing objects in the selected set (all those classes plus rdfs:label) are returned. Then, the --axioms annotation option makes sure only annotation axioms are selected, and not any logical connections between these classes.

--select CURIE=@en and --select CURIE=^^xsd:string sound good.

I think the goal in #571 is just to remove the rdfs:label=@en annotations, not to remove any of the classes.

Yeah - the above command does that with the --include-term. I'll make the changes to add the language and datatype selectors here, but I'll wait on --include-term for #570.

Ok, I reread #571 and now I think I understand. The general goal is to remove all the rdfs:labels that are not @en or plain literals. That's complicated. But there's a sub-goal that this PR will support with just remove --select 'rdfs:label=@zh'.