[topicmapmail] PSIs?

[Murray Altheim]

Lars Marius Garshol wrote:
> * Martin Bryan
> | 
> | To me, using identifiers for datatypes that reference the formal W3C
> | definitions of these datatypes makes more sense than inventing
> | separate PSIs.
> 
> I agree completely. Especially when the W3C is already using those
> same URIs.

Martin,

Have you read the relevant section in the OWL ref [1] that Lars Marius
is referring to? All OWL has done is *itself* create a new set of
URIs. They aren't actuallly XSD URIs, i.e., they don't point at anything,
specifically not IDs within the XSD Recommendation. And they are not
merely a mirror of XSD, as OWL modifies their usage and recommends NOT
using some of them (particularly, one I want to use: "xsd:duration").
They also add a few of their own ("rdf:XMLLiteral" and "rdfs:Literal").

I could add a section similar to OWL's regarding which datatypess to use
and which not to, but I'd rather leave that to domain considerations.
And we can't be using "rdf:XMLLiteral" since that embeds XML content
in an XTM document. et cetera.

> | (I'm also thinking about how we should reference these datatypes
> | within Part 5 of the forthcoming DSDL spec, of which I am the
> | editor, so I have a specific use for whatever PSIs we end up in
> | mind. Referring to the W3C addresses makes more sense in an ISO
> | standard than does referencing PSIs originating from a non-standards
> | body.)
> 
> In that case I think WG1 and WG3 should agree on a solution to this
> that is used both by DSDL and by TMCL. Probably something to settle in
> London. 

There's nothing wrong with this community doing the same thing as
OWL did, and as I said to Lars Marius, I'd rather point directly
at XSD than point at it via OWL via RDF. We can add subject identity
for those datatypes in OWL that are still identical to XSD if people
think that's necessary.

Murray

[1] http://www.w3.org/TR/owl-ref/#rdf-datatype
......................................................................
Murray Altheim                  <http://kmi.open.ac.uk/people/murray/>
Knowledge Media Institute
The Open University, Milton Keynes, Bucks, MK7 6AA, UK

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