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Re: big issue (2001-09-28#13) & changes in MT

From: Sergey Melnik <melnik@db.stanford.edu>
Date: Mon, 01 Oct 2001 17:46:18 -0700
Message-ID: <3BB90E5A.636E15E7@db.stanford.edu>
To: Pat Hayes <phayes@ai.uwf.edu>
CC: w3c-rdfcore-wg@w3.org
Pat,

I'm thinking of how composite literals may be potentially introduced in
the MT document, and what the implications of that could be.

A first shot at MT of datatyping could be this: assuming that literal
constants are pairs of kind (URI, unicode string), let the URIs
(resource constants) be mapped to resources as before using function IS.
Additionally, one could define a mapping IDT from IR into the powerset
of LV that maps each datatype-resource to its extension, namely, the set
of all literals that correspond to this datatype. For example, if X001
is an interpretation of resource constant
[http://www.w3.org/2001/XMLSchema-datatypes, integer], so the extension
of the datatype XOO1, i.e. IDT(X001), would include all "integer"
literals.

Some general comments on MT:

I very much welcome your move towards a cleaner separation between RDF
and RDFS. I think it maybe worth it to emphasize the point that other
languages (besides RDFS) can be layered on top of RDF, and to illustrate
how their semantics can be defined incrementally (e.g., using the
I-mappings of the underlying languages). In this light, RDFS-MT could be
presented as a proof-of-concept of how this layering is done.

A minor comment: could you make sure that all symbols are introduced in
the same section (or are summarized in a table)? For example, most of
the definitions are in 1.4, but LV and XL appear first in 1.3. Another
issue, which I raised in my previous email, is a consistent naming of
constants vs. individuals in the domain of discourse (e.g. resource
constant and literal constant instead of URI and literal, or something
like this).

Thanks for your work on the MT document!

Sergey
Received on Monday, 1 October 2001 20:20:55 EDT

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