Prolog

Without namespaces, this is very terse:

human(pat).
dog(rover).            % we have to assign a name
name(pat, "Pat Smith").
name(pat, "Patrick Smith").
name(rover, "Rover").
pet(pat, rover).

One approach to namespaces:

ns(ns1_, "http://www.w3.org/2000/10/swap/test/demo1/about-pat").
ns(bio_, "http://www.w3.org/2000/10/swap/test/demo1/biology#").
ns(per_, "http://www.w3.org/2000/10/swap/test/demo1/friends-vocab#").
bio_Human(ns1_pat).
bio_Dog(rover).      # unprefix could be be NodeIDs...
per_name(ns1_pat, "Pat Smith").
per_name(ns1_pat, "Patrick Smith").
per_name(rover, "Rover").
per_pet(ns1_pat, rover).