We are approaching the SemanticWeb ...
In the meantime, the iMolTalk server can provide a RDF (resource description framework) of a PDB formatted file:
http://i.moltalk.org/pdb_information_rdf/2/PDB/<code>
Example: http://i.moltalk.org/pdb_information_rdf/2/PDB/1TAR
(Note: this is very preliminary. )
URLs pointing towards the SemanticWeb:
http://esw.w3.org/topic/SemanticWebTools
http://en.wikipedia.org/wiki/Semantic_Web
http://en.wikipedia.org/wiki/Resource_Description_Framework (RDF)