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   Re: [xml-dev] URI indigestion

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"Bullard, Claude L (Len)" scripsit:

> So if the Public ID is used 
> in RDF for the Semantic Web, where does uniqueness 
> get conferred?

Public IDs that begin "IDN domain-name//" are as unique
as domains (which is to say, only during a given period of
time).  This is part of ISO 9070 on Formal Public Identifiers.

> Further, there is the issue that URIs designate 
> representations of resources and that these can 
> vary over time/space/authorial_intent, etc,. and 
> that this conflicts with the RDF requirement for 
> insisting that the URI uniquely identifies one 
> thing.

I hold that URIs designate resources.  The GET method
returns some representation of the resource, if one is
available. This is equally true of an URN  as of an URL.

> 1.  What is the one thing that it identifies 
>     for URIs?

Some resources don't have representations, the "thing
without a rep" trick notwithstanding.

> 2.  Are these resources (can only be one) or 
>     representations (can vary)?


John Cowan   jcowan@reutershealth.com   http://www.reutershealth.com
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