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<xsl:stylesheet xmlns:xsl="http://www.w3.org/1999/XSL/Transform"
version="1.0">
<xsl:output method="text"/>
<xsl:template match="sect1|sect2|sect3">
<xsl:if test="not(@id)">
<xsl:message>No identifier in chapter '<xsl:value-of select="ancestor::chapter/@id"/>', section '<xsl:value-of select="title"/>'
</xsl:message>
</xsl:if>
<xsl:apply-templates/>
</xsl:template>
<xsl:template match="*|@*|text()">
<xsl:apply-templates/>
</xsl:template>
</xsl:stylesheet>