schema-aware.com - a portable transform across basic and schema-aware processors

<xsl:stylesheet xmlns:xsl="http://www.w3.org/1999/XSL/Transform" xmlns:xs="http://www.w3.org/2001/XMLSchema" version="2.0">

    <xsl:import-schema schema-location="input.xsd"
        namespace="http://www.example.com"
        use-when="system-property('xsl:is-schema-aware')='yes'" />

    <xsl:import-schema schema-location="output.xsd"
        use-when="system-property('xsl:is-schema-aware')='yes'" />

    <xsl:template match="/" use-when="system-property('xsl:is-schema-aware')='yes'" priority="2">

        <xsl:variable name="input" as="document-node()">
            <xsl:document validation="strict">
                <xsl:copy-of select="/" />
            </xsl:document>
        </xsl:variable>

        <xsl:result-document validation="strict">
            <xsl:apply-templates select="$input/the-root-elem" />
        </xsl:result-document>

    </xsl:template>

    <xsl:template match="/">
        <xsl:apply-templates select="the-root-elem" />
    </xsl:template>

    <xsl:template match="the-root-elem">
        <xsl:apply-templates />
    </xsl:template>

</xsl:stylesheet>

The stylesheet contains two root matching templates. The first one has a use-when attribute and a higher priority, which means when the use-when evalutates to true (when the transform is run using a schema-aware processor) that template will be used in preference to the other root matching template. In this case, I validate the input using the $input variable and perform result validation on the output.

A portable transform across basic and schema-aware processors