URIs / URLs

Hello RDF folks,

There is a recurring debate on both RDF lists about URIs, what they
mean, and how some problems with RDF come from problems with them.

Actually, we think there is actually a problem URIs, and especially with
URLs used as URIs.

Here is an attempt to clarify those problems and give some pieces of
solution.

  Pierre-Antoine Champin

HTML and PDF version available at 
  http://www710.univ-lyon1.fr/~champin/urls/