--- /dev/null
+<?xml version="1.0" encoding="utf-8"?>
+<xsl:stylesheet xmlns:xsl="http://www.w3.org/1999/XSL/Transform"
+ version="1.0">
+
+ <xsl:output method="xml"/>
+
+ <xsl:template match='/'>
+ <refcheck>
+ <xsl:apply-templates select='//xref' mode='missing'/>
+ <xsl:apply-templates select='//reference' mode='orphans'/>
+ <xsl:apply-templates select='//references[@dwdrfc-type = "norm"]' mode='normcheck'/>
+ <xsl:apply-templates select='//xref[@dwdrfc-type = "norm"]' mode='normrefs'/>
+ </refcheck>
+ </xsl:template>
+
+ <xsl:template match='xref' mode='missing'>
+ <xsl:param name='refname'>
+ <xsl:value-of select='@target'/>
+ </xsl:param>
+ <xsl:param name='reftgt'>
+ <xsl:value-of select='//*[@anchor = $refname]/@anchor'/>
+ </xsl:param>
+ <xsl:choose>
+ <xsl:when test='$reftgt = $refname'/>
+ <xsl:otherwise>
+ <missing><xsl:value-of select='$refname'/></missing><xsl:text>
+ </xsl:text>
+ </xsl:otherwise>
+ </xsl:choose>
+ </xsl:template>
+
+ <xsl:template match='xref' mode='normrefs'>
+ <xsl:param name='refname'>
+ <xsl:value-of select='@target'/>
+ </xsl:param>
+ <xsl:param name='reftgt'>
+ <xsl:value-of select='//references[@dwdrfc-type = "norm"]/*[@anchor = $refname]/@anchor'/>
+ </xsl:param>
+ <xsl:choose>
+ <xsl:when test='$reftgt = $refname'/>
+ <xsl:otherwise>
+ <missing-norm><xsl:value-of select='$refname'/></missing-norm><xsl:text>
+ </xsl:text>
+ </xsl:otherwise>
+ </xsl:choose>
+ </xsl:template>
+
+ <xsl:template match='reference' mode='orphans'>
+ <xsl:param name='refname'>
+ <xsl:value-of select='@anchor'/>
+ </xsl:param>
+ <xsl:param name='reftgt'>
+ <xsl:value-of select='//xref[@target = $refname]/@target'/>
+ </xsl:param>
+ <xsl:if test='$reftgt != $refname'>
+ <orphan><xsl:value-of select='$refname'/></orphan><xsl:text>
+ </xsl:text>
+ </xsl:if>
+</xsl:template>
+
+<xsl:template match='references' mode='normcheck'>
+ <xsl:apply-templates mode='normcheck'/>
+</xsl:template>
+
+<xsl:template match='*' mode='normcheck'>
+ <!-- Need to find at least one normative reference -->
+ <xsl:param name='refname'>
+ <xsl:value-of select='@anchor'/>
+ </xsl:param>
+ <xsl:param name='reftgt'>
+ <xsl:value-of select='//xref[@dwdrfc-type = "norm" and @target = $refname]/@target'/>
+ </xsl:param>
+ <xsl:if test='$refname != $reftgt'>
+ <normchk><xsl:value-of select='$refname'/></normchk><xsl:text>
+</xsl:text>
+ </xsl:if>
+</xsl:template>
+
+<xsl:template match='text()' mode='normcheck'/>
+
+</xsl:stylesheet>