Just reading over some of the issues and on [1] there is the argument
that using ":" would interfere with SPARQL somehow. I haven't noticed
the : in Bio2RDF URI's interfering with my SPARQL queries so far. Is
there something I don't know about?
My reasoning for sticking with : is that it keeps the
namespace:identifier combination together and recongisable, so you
don't have to predesign the whole system around the
namespace/identifier which you do if you use the URL path separator
"/".
Cheers,
Peter