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Status/plans

From: Henry S. Thompson <ht@cogsci.ed.ac.uk>
Date: 08 Apr 2000 11:51:49 +0100
To: xmlschema-dev@w3.org
Message-ID: <f5bln2okgqi.fsf@cogsci.ed.ac.uk>
Richard Tobin and I have been working on a schema validator since late
last year.  It implements the basic architecture, including <include>,
<import>, xsi:type, type def derivation.  It checks content models
including equivalence classes, attribute decls, keys/keyrefs,
minimally implements <any/>.  It has only a token effort at the
semantics of the primitive datatypes.  It's implemented in Python on
top of our C-based validating XML parser [1], and is basically split
into three layers:

 1) A declarative mapping from XML infoset to application structures
    (this could have any other DOM-style parser retrofitted easily);
 2) Construction and checking of schema components;
 3) Instance validation.

I'm in the midst of completely re-implementing level (2), hope to
release at least a web-based validator via the W3C during the next
week.  Once we go to CR, I expect we'll release it open source.

Anybody else care to summarise where their effort stands?

ht
-- 
  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 Saturday, 8 April 2000 06:51:52 GMT

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