W3C home > Mailing lists > Public > xmlschema-dev@w3.org > November 2002

Re: redefine and multiple includes

From: Henry S. Thompson <ht@cogsci.ed.ac.uk>
Date: 05 Nov 2002 14:40:01 +0000
To: "Francis Brouns" <francis.brouns@ou.nl>
Cc: <xmlschema-dev@w3.org>
Message-ID: <f5blm48ulku.fsf@erasmus.inf.ed.ac.uk>

ht@cogsci.ed.ac.uk (Henry S. Thompson) writes:

> I've just implemented it, and it's happy with your schema and the
> obvious instance.  Will release later today/tomorrow.

Now released, to CVS, in online webform version and downloadable exe.

This reduces to four the number of unimplemented aspects of the
Structures part of W3C XML Schema in XSV:

 1) All groups aren't properly checked or enforced;
 2) ID/IDREF isn't checked;
 3) Identity constraints are compared as strings, not values;
 4) All numeric exponents >100 are treated as 100.

The first two are straight-forward but tedious -- SMOP.

The third is hard, as it requires implementing lexical->value space
conversion which is not always obvious.

The fourth will never happen, it makes denial of service attacks too

From Datatypes, a lot of simple type enforcement is still missing, and
will probably stay that way. . .

There will soon be an erratum moving responsibility for enforcing
ENTITY and ENTITIES to Structures, at which point the above count will
rise to five :-(

  Henry S. Thompson, HCRC Language Technology Group, University of Edinburgh
          W3C Fellow 1999--2002, part-time member of W3C Team
     2 Buccleuch Place, Edinburgh EH8 9LW, SCOTLAND -- (44) 131 650-4440
	    Fax: (44) 131 650-4587, e-mail: ht@cogsci.ed.ac.uk
		     URL: http://www.ltg.ed.ac.uk/~ht/
 [mail really from me _always_ has this .sig -- mail without it is forged spam]
Received on Tuesday, 5 November 2002 09:40:04 UTC

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