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Dear Reader,

Welcome to another issue of XML.com.

This week we have an interesting piece from David Orchard, in which he
describes a "theory of compatible versions," that is, a theory for the
conditions under which two different versions of a language will be
compatible. This work applies to any XML-based language or vocabulary, and
includes the interesting conclusion that the first version of such a
language must include an extensibility mechanism.

A deep read for the holiday season!

A Theory of Compatible Versions
http://www.xml.com/pub/a/2006/12/20/a-theory-of-compatible-versions.html

Semantic Wikis and Disaster Relief Operations
http://www.xml.com/pub/a/2006/12/13/semantic-wikis-and-disaster-relief-operations.html

Also worth reading this week:

Announcing the Tools of Change Conference
http://www.xml.com/pub/a/2006/12/20/tools-of-change-conference.html

As always, thanks for reading.

Kendall Clark
kendall@xml.com
Managing Editor, XML.com

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