"Namespaces facility"

As I understand M&S, only properties, not resources, have the 
"Namespaces facility" : if resources are sharing a same base URL 
within an RDF file, this URL must be repeated in the file.

This puzzles me. Nobody else ?

Best regards,
Francois-Paul Servant
33 1 45 54 46 72 ; 170 rue de Lourmel 75015 PARIS
mailto:hypersol@micronet.fr
http://www.hypersolutions.fr