Reading non referenced complexTypes from a Schema

[Andrea009]

I have searched through the forums but so far unable to locate anything.

How can I enumerate complexType declarations in a schema when they do not
have an element referencing them ?

e.g. (snippet)

        <xs:complexType name="foo_extension">
           <xs:complexContent>
               <xs:extension base="foo">
                  <xs:attributeGroup ref="foo_properties"/>
                </xs:extension>
           </xs:complexContent>
        </xs:complexType>


If I include <xs:element name="foo_extension"/> then using the following
code is fine:

RefHash3KeysIdPoolEnumerator<SchemaElementDecl> schemaElemEnum =
grammar->getElemEnumerator();

and I can loop around getting all the information I require. 

However an element declaration is not mandatory for the extension to be
referenced using an xsi:type in the data. I need to read in the schema and
get all non-referenced complexTypes before I start looking at data. Is there
a way? I cannot see anything immediately obvious.

Thanks for your help.

Andrea




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