- From: pat hayes <phayes@ai.uwf.edu>
- Date: Sun, 26 Jan 2003 10:00:09 -0700
- To: "Peter F. Patel-Schneider" <pfps@research.bell-labs.com>
- Cc: www-rdf-comments@w3.org, w3c-rdfcore-wg@w3.org
>I believe that there is a missing part of datatypes in the RDF model
>theory, and, moreover, that this missing part makes datatypes unusable
>in RDF. The missing part is a mechanism for tieing a URI reference to
>a datatype.
The model theory assumes that some urirefs denote datatypes. It does
not, and I believe should not, specify the mechanism by which such a
name-value association is created or established or communicated.
These issues are concerned with the use of urirefs as names, and
therefore go beyond the remit of the RDF WG, and also beyond the
theoretical area of model theory, in fact.
I agree that there is an important issue here which needs to be
addressed by someone, but I do not think it is up to us to deal with
it. It goes well beyond RDF, and has consequences for all users of
the SW. It is a job for a TAG group, in my opinion.
>
>For example, suppose that I want to have a datatype that takes octal
>numerals to the appropriate integer. According to Section 3.4, I
>create a datatype whose lexical space is octal numerals, those value
>space is the integers, and whose lexical-to-value mapping is the
>appropriate one. Suppose further that I only want this one datatype.
>I then form the set containing only this datatype (and some other
>domain element for XML Literals). Let's call my datatype O and the
>datatype for XML Literals X, so I need to form the set { O,X } .
You also need to 'associate' a uriref with your datatype in such a
way that an RDF engine can access the needed information by using
your uriref. Exactly how this is to be done I do not know. I do not
know even how to specify that it should be done. I imagine that some
set of protocols will be required which will involve an API
accessible by using the uriref as a URL in the usual way. But these
matters go outside and beyond the model theory.
Pat
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Received on Sunday, 26 January 2003 11:58:51 UTC