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copied!<p>The global declaration of the <code>title</code> attribute puts that attribute in the target namespace <code>urn:test</code>. That also means that you must qualify the reference to the attribute, both in the schema and in the instance document. By default, unqualified attributes have no namespace.</p> <pre><code><xs:schema targetNamespace="urn:test" xmlns:xs="http://www.w3.org/2001/XMLSchema" elementFormDefault="qualified" xmlns="urn:test" xmlns:test="urn:test" > .... <xs:complexType name="ContentType"> <xs:simpleContent> <xs:extension base="xs:string"> <xs:attribute ref="test:title" use="required" /> </xs:extension> </xs:simpleContent> </xs:complexType> <xs:attribute name="title" type="xs:string" /> </code></pre> <p>and</p> <pre><code><root xmlns="urn:test" xmlns:test="urn:test" > <content test:title="Title"> Content comes here... </content> </root> </code></pre> <p>This whole thing is quite subtle and when I try to validate the original instance document in ecplise I get two very confusing errors:</p> <ol> <li>The <code>title</code> attribute <em>cannot</em> appear on the content element. This refers to the unqualified use of the attribute, and</li> <li>The <code>title</code> element <em>must</em> appear on the content element. This refers to the missing qualified <code>test:title</code> attribute.</li> </ol> <p>Granted, the error message could use a bit more context information.</p>

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