W3C XML Schema language permits different content models for elements with the same name, as long as the validator can unambiguously determine which content model applies. Your examples are legal.
Bob Schloss
XML/XSL Transformational Systems
IBM Thomas J. Watson Research Center
Yorktown Heights, New York, USA
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Subject: Allowable schema representations
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:sequence>
- <xsd:element name="A" type="xsd:string"/>
</xsd:sequence>
<xsd:complexType name="C2">
- <xsd:sequence>
<xsd:element name="A" type="C1"/>
<xsd:element name="A" type="xsd:string"/>
</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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