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Why not just use RELAX NG? [1] I don't know if this RNG schema captures all your
requirements, but your two instances are valid wrt it. The interleave element is
useful here.[2] In this content model, identifier is required but the other
elements are optional (zero or one), but they may all be interleaved, that is,
they can appear in any order together.
<grammar xmlns="http://relaxng.org/ns/structure/1.0";
ns="http://www.imtf.com/test";
datatypeLibrary="http://www.w3.org/2001/XMLSchema-datatypes";>
<start>
<element name="metadata" xmlns="http://relaxng.org/ns/structure/1.0";>
<interleave>
<element name="identifier">
<data type="string"/>
</element>
<ref name="other"/>
</interleave>
</element>
</start>
<define name="other">
<optional>
<element name="name">
<data type="string"/>
</element>
</optional>
<optional>
<element name="subject">
<data type="string"/>
</element>
</optional>
<optional>
<element name="title">
<data type="string"/>
</element>
</optional>
</define>
</grammar>
You can of course refine the datatypes to your liking. If you must use XML
Schema, just translate this RNG schema into XSD with Trang.[3] I used the Jing
validator to validate your instances against this schema.[4]
Mike
[1] http://relaxng.org
[2] http://relaxng.org/tutorial-20011203.html#IDAN1YR
[3] http://thaiopensource.com/relaxng/trang.html
[4] http://thaiopensource.com/relaxng/jing.html
Hess Yvan wrote:
> I want to design a complexType named "metadata" that forces the presence of
> an "identifier" element and allows any others elements not predefined.
> Moreover the "identifier" and the others elements can appear in any order
> into the "metadata" element. Here are examples of valid xml instances:
>
> <metadata xmlns="http://www.imtf.com/test";>
> <identifier>urn:hsc:1234</identifier>
> <name>Hess Yvan</name>
> </metadata>
>
> <metadata xmlns="http://www.imtf.com/test";>
> <subject>This is the subject</subject>
> <identifier>urn:hsc:1234</identifier>
> <title>This is the title</title>
> </metadata>
>
> I implemented the following xml schema complexType but it doesn't work:
>
> <xs:element name="metadata">
> <xs:complexType>
> <xs:choice minOccurs="0" maxOccurs="unbounded">
> <xs:element name="identifier" type="xs:string"/>
> <xs:any processContents="lax" minOccurs="0" maxOccurs="unbounded"/>
> </xs:choice>
> </xs:complexType>
> </xs:element>
>
>
> I get the following error with Xerces validation and a similar one with XSV
> (it seems I violate the "Unique Particle Attribution").
>
> [Error] choice.xsd:4:23: cos-nonambig: "http://www.imtf.com/test":identifier
> and
> WC[##any] (or elements from their substitution group) violate "Unique
> Particle
> Attribution". During validation against this schema, ambiguity would be
> created
> for those two particles.
> choice.xml: 571 ms (3 elems, 1 attrs, 0 spaces, 30 chars)
>
> If I change my xml schema using sequence instead of choice as follow:
>
> <xs:element name="metadata">
> <xs:complexType>
> <xs:sequence>
> <xs:element name="identifier" type="xs:string"/>
> <xs:any processContents="lax" minOccurs="0" maxOccurs="unbounded"/>
> </xs:sequence>
> </xs:complexType>
> </xs:element>
>
> it works but in this case the "identifier" element must be at the FIRST
> position and I don't want that !!!
>
> Please can you help me to solve this problem. I have no idea how to solve it
> !!!
>
> Regards. Yvan Hess
>
> --------------------------------------------------------
> XML file:
>
> <?xml version="1.0" encoding="UTF-8"?>
> <metadata xmlns="http://www.imtf.com/test";
> xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance";
> xsi:schemaLocation="http://www.imtf.com/test choice.xsd">
> <identifier>urn:hsc:1234</identifier>
> <name>Hess Yvan</name>
> </metadata>
>
> --------------------------------------------------------
> XML schema file:
>
> <?xml version="1.0" encoding="UTF-8"?>
> <xs:schema targetNamespace="http://www.imtf.com/test";
> xmlns="http://www.imtf.com/test"; xmlns:xs="http://www.w3.org/2001/XMLSchema";
> elementFormDefault="qualified" attributeFormDefault="unqualified">
> <xs:element name="metadata">
> <xs:complexType>
> <xs:choice minOccurs="0" maxOccurs="unbounded">
> <xs:element name="identifier" type="xs:string"/>
> <xs:any processContents="lax" minOccurs="0"
> maxOccurs="unbounded"/>
> </xs:choice>
> </xs:complexType>
> </xs:element>
> </xs:schema>
>
>
>
>
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