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RE: [xml-dev] XML schema - multiple import of module

Unfortunately the topic of schema composition is one where the spec isn't
all that prescriptive, and where in consequence there are differences
between implementations.

Having said that, I can't see why you have three schema documents or why you
are trying to use xs:redefine.

You should have two schema documents, one for each namespace, and each
should reference the other using an xsl:import. If your chosen tool doesn't
allow that, I can only suggest you try a different tool.

Regards,

Michael Kay
http://www.saxonica.com/
http://twitter.com/michaelhkay  

> -----Original Message-----
> From: DUNN, Mark [mailto:mark.dunn@oup.com] 
> Sent: 04 June 2009 17:35
> To: xml-dev@lists.xml.org
> Subject: [xml-dev] XML schema - multiple import of module
> 
> Hello,
> 
> I'm new to XML Schemas, and investigating conversion of a DTD 
> to an XML Schema. I have a problem describing the Schema 
> version of the following
> structure:
> 
> <doc>
>  <div>
>   <title>Section 1</title>
>   <p>Some text...</p>
>   <p>
>    <law:extraxt>
>     <title>Title of Regulation</title>
>     <p>Text of regulation</p>
>    </law:extract>
>   </p>
>  </div>
> </doc>
> 
> 
> The problem is in the non-namespaced <title> and <p> elements 
> occurring within the namespaced <law:extract> element. They 
> are the same as the ones occurring outside this element, so 
> I'd like to define them only once.
> 
> My attempt at expressing this structure uses three .xsd files:
> 
> main.xsd:
> 
> <xs:schema xmlns:xs="http://www.w3.org/2001/XMLSchema";
> xmlns="http://xsd.oup.com/ac-xsd/";
> xmlns:law="http://xsd.oup.com/ac-law/";
> targetNamespace="http://xsd.oup.com/ac-xsd/";
> elementFormDefault="qualified">
> 	<xs:redefine schemaLocation="struct.xsd">
> 		<xs:group name="paragraph-content">
> 			<xs:choice>
> 				<xs:group ref="paragraph-content"/>
> 				<xs:element ref="law:extract"/>
> 			</xs:choice>
> 		</xs:group>
> 	</xs:redefine>
> 	<xs:import namespace="http://xsd.oup.com/ac-law/";
> schemaLocation="law.xsd"></xs:import>
> 	...
> </xs:schema>
> 
> law.xsd:
> 
> <xs:schema xmlns:xs="http://www.w3.org/2001/XMLSchema";
> elementFormDefault="qualified"
> targetNamespace="http://xsd.oup.com/ac-law/";
> xmlns:law="http://xsd.oup.com/ac-law/";
> xmlns:struct="http://xsd.oup.com/ac-xsd/";>
> 	<xs:import schemaLocation="struct.xsd"
> namespace="http://xsd.oup.com/ac-xsd/";></xs:import>
> 	<xs:element name="extract">
> 		<xs:complexType>
> 			<xs:sequence>
> 				<xs:element ref="struct:title"
> minOccurs="0"/>
> 				<xs:element ref="struct:p"
> minOccurs="1"/>
> 			</xs:sequence>
> 		</xs:complexType>
> 	</xs:element>
> 	...
> </xs:schema> 
> 
> 
> struct.xsd:
> 
> <xs:schema xmlns:xs="http://www.w3.org/2001/XMLSchema";
> elementFormDefault="qualified" attributeFormDefault="unqualified"
> targetNamespace="http://xsd.oup.com/ac-xsd/";
> xmlns="http://xsd.oup.com/ac-xsd/";>
> 	<xs:group name="general-inline">
> 		<xs:choice>
> 			<xs:element ref="b"/>
> 			<xs:element ref="i"/>
> 		</xs:choice>
> 	</xs:group>
> 	<xs:group name="paragraph-content">
> 		<xs:choice>
> 			<xs:group ref="general-inline"></xs:group>
> 			<!-- ... [plus others] ... --->
> 		</xs:choice>
> 	</xs:group>
> 	<xs:element name="p">
> 		<xs:complexType mixed="true">
> 			<xs:choice minOccurs="0" maxOccurs="unbounded">
> 				<xs:group ref="paragraph-content"/>
> 			</xs:choice>
> 		</xs:complexType>
> 	</xs:element>
> 	...
> </xs:schema>
> 
> 
> When I try saving the schema files in XMLSpy 2009, I get an 
> error saying that <title> is already declared, presumably 
> because the file struct.xsd has ben imported twice.
> 
> The W3C spec says that importing twice is legitimate, but 
> vendors are encouraged to raise it as an error. Fair enough - 
> I don't like the circularity in my description.
> 
> But the structure itself seems reasonable, I just can't see a 
> way of expressing it in XML Schema.
> 
> Can anyone help?
> 
> 
> Kind regards,
> 
> Mark Dunn
> XML Data Engineer
> Oxford University Press
> 
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