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Re: designating datatypes

From: Dave Beckett <dave.beckett@bristol.ac.uk>
Date: Mon, 24 Feb 2003 11:51:20 +0000
To: pat hayes <phayes@ai.uwf.edu>
cc: w3c-rdfcore-wg@w3.org
Message-ID: <7019.1046087480@hoth.ilrt.bris.ac.uk>

>>>pat hayes said:
> Dave, you might be interested in a change Im proposing to the 
> datatypes section in the semantics document, as follows, in response 
> to a comment by Peter. It introduces the 'name' as an integral part 
> of a datatype. This is a patch and if you can think of a better 
> terminology and a pointer to a suitable spec I  would be delighted.

> 3.4 Dattayped interpretations

Datatyped

> 
> A datatype is an entity named by a uriref and characterized by a set 
> of character strings called lexical forms and a mapping from that set 
> to a set of values. (The built-in datatype rdf:XMLLiteral, 

If it is built-in, won't you have to say a bit more?  Maybe put this
after defining what an (RDF) datatyped interpretation is.

> exceptionally, allows pairs in its lexical space.) Exactly how these 
> sets and mapping are defined is a matter external to RDF.
> 
> Formally, we will describe a datatype d as a 4-tuple consisting of
> 
> 1. A uriref called the name of d
> 
> 2. A set of character strings called the lexical space of d
> 
> 3. A set called the value space of d
> 
> 4. A mapping L2V(d) from the lexical space of d to the value space of 
> d, called the lexical-to-value mapping of d
> ...

So now you could say there is a built in datatype, and it is defined
[HERE] or give pointers:

1.  Name:           URI reference rdf:XMLLiteral
2.  Lexical Space:  }
3.  Value Space:    } See http://www.w3.org/TR/rdf-concepts/#section-XMLLiteral
4.  Mapping:        }


If you follow that link you'll see the terminology is similiar, but
concepts calls it the datatype URI not name.  Maybe we should stick
to one term?  Datatype name?  Datatype URI?

Dave
Received on Monday, 24 February 2003 06:53:32 EST

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