[Person-ontology] identifiers vs. descriptions

[Philippe Martin]

> This appears to be relevant to both ontology description and sharing
> as well as to instance description and sharing. However, this
> capability appears to be orthogonal to the specific ontologies
> and knowledge representation languages that might be used.

With a concise notation, it is sometimes more convenient to 
describe a few properties of an object (that uniquely identify
the object) rather than creating/searching/using its identifier 
(URI, XRI, local identifier, etc.).

Philippe