Allowable schema representations

[Loz]

If I define an XML schema as follows:
<?xml version="1.0" encoding="UTF-8"?>
<!-- strange.xsd -->
<xsd:schema xmlns:xsd="http://www.w3.org/2001/XMLSchema";
            targetNamespace="http://localhost/strange";
            xmlns="http://localhost/strange";
            elementFormDefault="qualified">
        <xsd:complexType name="C1">
                <xsd:sequence>
                        <xsd:element name="A" type="xsd:string"/>
                </xsd:sequence>
        </xsd:complexType>
        <xsd:complexType name="C2">
                <xsd:sequence>
                        <xsd:element name="A" type="C1"/>
                        <xsd:element name="A" type="xsd:string"/>
                </xsd:sequence>
        </xsd:complexType>
        <xsd:element name="A" type="C2"/>
</xsd:schema>
then an instance document looks like
<?xml version="1.0" encoding="UTF-8"?>
<!-- strange.xml -->
<A xmlns="http://localhost/strange";
        xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance";
        xsi:schemaLocation="http://localhost/strange strange.xsd">
        <A>
                <A>foo</A>
        </A>
        <A>bar</A>
</A>
Is there anything inherently wrong with having an "A" element used in 
many different ways? Xerces will certainly validate the document OK, and 
I couldn't find anything in the xml-schema spec that invalidates this.
It looks strange to me, as I don't think you could have defined this 
structure using a DTD. Does anyone have a view on this?

cheers
Loz
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