prefix.cc: namespace lookup for RDF developers
From the about page:
The intention of this service is to simplify a common task in the work of RDF developers: remembering and looking up URI prefixes.
You can look up prefixes from the search box on the homepage, or directly by typing URLs into your browser bar, such as http://prefix.cc/foaf or http://prefix.cc/foaf,dc,owl.ttl.
New prefix mappings can be added by anyone. If multiple conflicting URIs are submitted for the same namespace, visitors can vote for the one they consider the best. You are only allowed one vote or namespace submission per day.
For n3, xml, rdfa, sparql, the result interface shows the URI prefixes in use.
But if there is more than one URI prefix, difference URI prefixes appear with each example.
Don’t multiple, conflicting URI prefixes seem problematic to you?