schemas for XML Modularization

I just noticed that appendices A-C of XML Modularization [1] have language 
like:

        This appendix will contain instructions on how to define XML 
Schema
        modules that are compatible with the XHTML Modularization 
implementation
        via XML Schema [XMLSCHEMA] when XML Schema becomes a W3C
        Recommendation.

Why have these sections not be replaced, since it has been over 4 years 
since XML Schema became a rec?

pvb

[1] http://www.w3.org/TR/2001/REC-xhtml-modularization-20010410