[Bug 3241] Type hierarchy

http://www.w3.org/Bugs/Public/show_bug.cgi?id=3241

           Summary: Type hierarchy
           Product: XML Schema
           Version: 1.1 only
          Platform: PC
        OS/Version: Windows XP
            Status: NEW
          Severity: normal
          Priority: P2
         Component: Datatypes: XSD Part 2
        AssignedTo: cmsmcq@w3.org
        ReportedBy: mike@saxonica.com
         QAContact: www-xml-schema-comments@w3.org


QT approved comment:

Type hierarchy:

At the same time as introducing anyAtomicType, might not there be some sense in
introducing anyListType and anyUnionType, and perhaps even anyComplexType?

[For example, I think it would be useful on occasions in XSLT/XQuery to
determine whether the type of an attribute is list-valued, and this could be
done as "@a instance of attribute(*, xs:anyListType)". There are other
solutions, such as introducing metadata interrogatives.]