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New release of XSV: significant change

From: Henry S. Thompson <ht@cogsci.ed.ac.uk>
Date: 28 Oct 2001 18:40:46 +0000
To: xmlschema-dev@w3.org
Message-ID: <f5bn12b7glt.fsf@cogsci.ed.ac.uk>
Both the web [1] and the download [2] have been upgraded to XSV 1.3, which
represents a significant change in XSV internals.

Hitherto, XSV has pre-validated all schema documents involved in a
schema-validation episode with the DTD for schemas.  This was both not 
quite right, in that it meant certain constraints were not enforced,
because not expressed in the DTD, and messy, in that if a schema document
included an internal subset, it was tricky to preserve it.

With the advent of version 1.3, all schema documents are now
pre-validated with a pre-compiled version of the schema for schemas
itself.  Even if a DOCTYPE is present, XML 1.0 validation will not be
performed, although processing will reflect attribute defaults and
general entity bindings, as required by XML 1.0.

I've done my best with regression testing etc. to ensure that this new 
release is working properly, but such a major change is bound to
introduce new vulnerabilities -- early feedback about crashes and bugs 
will be welcome.

ht
[1] http://www.w3.org/2001/03/webdata/xsv
[2] ftp://ftp.cogsci.ed.ac.uk/pub/XSV/XSV13.EXE
-- 
  Henry S. Thompson, HCRC Language Technology Group, University of Edinburgh
          W3C Fellow 1999--2001, 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/
Received on Sunday, 28 October 2001 13:39:59 GMT

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