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LC-208 renaming equivalence classes

From: C. M. Sperberg-McQueen <cmsmcq@acm.org>
Date: Thu, 05 Oct 2000 23:30:50 -0600
Message-Id: <>
To: Philip Wadler <wadler@research.bell-labs.com>
Cc: W3C XML Schema Comments list <www-xml-schema-comments@w3.org>
Dear Phil:

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-208,
which suggests that the construct known in the last-call draft as
"equivalence classes" be renamed, to avoid confusion with the
mathematical concept of equivalence relations.

We thank you for opening this issue, and are pleased to report that we
have taken your suggestion and given the construct a new name,
"substitution groups", which should be less confusing.  (Your proposal
to use the term "subclasses" was felt likely to introduce an
unbearable degree of confusion between the complex-type inheritance
system and the substitution group system, which the WG prefers to
regard as separate  constructs.)

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.

with best regards,

-C. M. Sperberg-McQueen
  World Wide Web Consortium
  Co-chair, W3C XML Schema WG
Received on Thursday, 5 October 2000 21:49:48 UTC

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