LC-96: equivClass: common ancestor type

The W3C XML Schema Working Group has spent the last several months
working through the comments received from the public on the last-call
draft of the XML Schema specification.  We thank you for the comments
you made on our specification during our last-call comment period, and
want to make sure you know that all comments received during the
last-call comment period have been recorded in our last-call issues
list (http://www.w3.org/2000/05/12-xmlschema-lcissues).

Among other issues, you raised the point registered as issue LC-96,
requesting that substitution group members not be restricted to types
derived from their heads (new terminology).

After considerable discussion, in which some sympathy was expressed
for your position, the WG decided to retain the status quo here, on
the basis that we wished to maintain a degree of semantic coherence,
however modest, among the elements in a substitution group, so that
processors expecting the head would at least always find the same
minimum they were already guaranteed with respect to xsi:type.  We
will revisit this decision after feedback during the CR phase.

It would be helpful to us to know whether you are satisfied with the
decision taken by the WG on this issue, or wish your dissent from the
WG's decision to be recorded for consideration by the Director of
the W3C.

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, 7 October 2000 17:38:07 UTC