Soliciting feedback for Open GUID

Hello,

I recently released http://openguid.net in an attempt to establish a 
global subject identifier for the Semantic Web.

Open GUID consists of two things:

1. A lightweight ontology that links RDF resources based on human 
perceived identity.
2. A set of services to query and manipulate subjects.

Please forward any criticisms or suggestions.

Thanks,
Jason Borro