XML Schema equivClass.

[Arnold, Curt]

Ahh, the wonders of trying to force an OOP construct (inheritence) onto XML.  Basically, the problem is that "substitutibility" and "structure reuse" are very often at odds.  In OOP languages they go
together much more frequently than in XML.  equivClass really tries to address the substitutibility aspect.  While type inheritance primarily addresses the structure reuse aspect.  

However, content groups and attribute groups accomplish the same effects as type inheritance and equivClass's with much less complexity.  You might see my note
http://lists.w3.org/Archives/Public/www-xml-schema-comments/2000JanMar/0040.html , also you might check out my Schema HTMLHelp file at http://www.software.aeat.com/xml/resources.htm

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