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copied!<p>The best solution is to remove the <code><type/></code> element and only have a <code>xs:choice</code> for <code><a/></code> and <code><b/></code> and let the application consuming the xml sort out the type. </p> <p>Another solution might be to have a <code>xs:choice</code> for <code><a/></code> and <code><b/></code> use an xslt script to do a validation of the <code><type/></code> element in relation to <code><a/></code> and <code><b/></code>.</p> <p>First validate the xml against the xmlschema then use the xslt to do a transformation on it, if the result of the transform is empty string it is valid otherwise show the resulting string as an error message.</p> <p>Something like this...</p> <p><em>XmlSchema:</em> </p> <pre><code> <xs:element name="some-element"> <xs:complexType> <xs:sequence> <xs:element name="type" type="xs:integer" /> <xs:choice> <xs:element name="a" type="xs:string" /> <xs:element name="b" type="xs:string" /> </xs:choice> </xs:sequence> </xs:complexType> </xs:element> </xs:schema> </code></pre> <p><em>Xslt:</em></p> <pre><code><xsl:stylesheet version="1.0" xmlns:xsl="http://www.w3.org/1999/XSL/Transform" xmlns:demo="uri:demo:namespace"> <xsl:output method="text" /> <xsl:template match="/demo:some-element"> <xsl:if test="type = 1 and not(demo:a)"> When type equals 1 element a is requred. </xsl:if> <xsl:if test="type = 2 and not(demo:b)"> When type equals 2 element b is requred. </xsl:if> </xsl:template> </xsl:stylesheet> </code></pre>

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