Added local restrictions to PhysicalObject.

Added the SAREF namespace.
Removed some namespaces from SDH.

Some changes performed to the ontology to fix the error classes. However, Protege hangs when trying to load this ontology.

Raw RDF statements generated from GoogleRefine for the bldg extension.
No ontology added yet.

Version 4 of the diagram added.

Two old ttl deleted.

First version of the full ontology without comments