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+<?xml version='1.0'?>
+<xsl:stylesheet xmlns:xsl="http://www.w3.org/1999/XSL/Transform"
+                xmlns:fo="http://www.w3.org/1999/XSL/Format"
+                xmlns:doc="http://nwalsh.com/xsl/documentation/1.0"
+                exclude-result-prefixes="doc"
+                version='1.0'>
+
+<!-- ********************************************************************
+     $Id: ebnf.xsl 6910 2007-06-28 23:23:30Z xmldoc $
+     ********************************************************************
+
+     This file is part of the XSL DocBook Stylesheet distribution.
+     See ../README or http://docbook.sf.net/release/xsl/current/ for
+     copyright and other information.
+
+     ******************************************************************** -->
+
+<doc:reference xmlns="">
+<referenceinfo>
+<releaseinfo role="meta">
+$Id: ebnf.xsl 6910 2007-06-28 23:23:30Z xmldoc $
+</releaseinfo>
+<author><surname>Walsh</surname>
+<firstname>Norman</firstname></author>
+<copyright><year>1999</year><year>2000</year><year>2001</year>
+<holder>Norman Walsh</holder>
+</copyright>
+</referenceinfo>
+<title>HTML EBNF Reference</title>
+
+<partintro>
+<section><title>Introduction</title>
+
+<para>This is technical reference documentation for the DocBook XSL
+Stylesheets; it documents (some of) the parameters, templates, and
+other elements of the stylesheets.</para>
+
+<para>This reference describes the templates and parameters relevant
+to formatting EBNF markup.</para>
+
+<para>This is not intended to be <quote>user</quote> documentation.
+It is provided for developers writing customization layers for the
+stylesheets, and for anyone who's interested in <quote>how it
+works</quote>.</para>
+
+<para>Although I am trying to be thorough, this documentation is known
+to be incomplete. Don't forget to read the source, too :-)</para>
+</section>
+</partintro>
+</doc:reference>
+
+<!-- ==================================================================== -->
+
+<xsl:template match="productionset">
+  <xsl:variable name="id"><xsl:call-template name="object.id"/></xsl:variable>
+
+  <xsl:choose>
+    <xsl:when test="title">
+      <fo:block id="{$id}" xsl:use-attribute-sets="formal.object.properties">
+        <xsl:call-template name="formal.object.heading">
+          <xsl:with-param name="placement" select="'before'"/>
+        </xsl:call-template>
+
+        <fo:table table-layout="fixed" width="100%">
+          <fo:table-column column-number="1" column-width="3%"/>
+          <fo:table-column column-number="2" column-width="15%"/>
+          <fo:table-column column-number="3" column-width="5%"/>
+          <fo:table-column column-number="4" column-width="52%"/>
+          <fo:table-column column-number="5" column-width="25%"/>
+          <fo:table-body start-indent="0pt" end-indent="0pt">
+            <xsl:apply-templates select="production|productionrecap"/>
+          </fo:table-body>
+        </fo:table>
+      </fo:block>
+    </xsl:when>
+    <xsl:otherwise>
+      <fo:table id="{$id}" table-layout="fixed" width="100%">
+        <fo:table-column column-number="1" column-width="3%"/>
+        <fo:table-column column-number="2" column-width="15%"/>
+        <fo:table-column column-number="3" column-width="5%"/>
+        <fo:table-column column-number="4" column-width="52%"/>
+        <fo:table-column column-number="5" column-width="25%"/>
+        <fo:table-body start-indent="0pt" end-indent="0pt">
+          <xsl:apply-templates select="production|productionrecap"/>
+        </fo:table-body>
+      </fo:table>
+    </xsl:otherwise>
+  </xsl:choose>
+</xsl:template>
+
+<xsl:template match="productionset/title">
+  <!-- suppressed -->
+</xsl:template>
+
+<xsl:template match="production">
+  <xsl:param name="recap" select="false()"/>
+  <xsl:variable name="id"><xsl:call-template name="object.id"/></xsl:variable>
+  <fo:table-row>
+    <fo:table-cell>
+      <fo:block text-align="start">
+        <xsl:text>[</xsl:text>
+        <xsl:number count="production" level="any"/>
+        <xsl:text>]</xsl:text>
+      </fo:block>
+    </fo:table-cell>
+    <fo:table-cell>
+      <fo:block text-align="end">
+        <xsl:choose>
+          <xsl:when test="$recap">
+            <fo:basic-link internal-destination="{$id}"
+                           xsl:use-attribute-sets="xref.properties">
+              <xsl:apply-templates select="lhs"/>
+            </fo:basic-link>
+          </xsl:when>
+          <xsl:otherwise>
+            <fo:wrapper id="{$id}">
+              <xsl:apply-templates select="lhs"/>
+            </fo:wrapper>
+          </xsl:otherwise>
+        </xsl:choose>
+      </fo:block>
+    </fo:table-cell>
+    <fo:table-cell>
+      <fo:block text-align="center">
+        <xsl:copy-of select="$ebnf.assignment"/>
+      </fo:block>
+    </fo:table-cell>
+    <fo:table-cell>
+      <fo:block>
+        <xsl:apply-templates select="rhs"/>
+        <xsl:copy-of select="$ebnf.statement.terminator"/>
+      </fo:block>
+    </fo:table-cell>
+    <fo:table-cell border-start-width="3pt">
+      <fo:block text-align="start">
+        <xsl:choose>
+          <xsl:when test="rhs/lineannotation|constraint">
+            <xsl:apply-templates select="rhs/lineannotation" mode="rhslo"/>
+            <xsl:apply-templates select="constraint"/>
+          </xsl:when>
+          <xsl:otherwise>
+            <xsl:text>&#160;</xsl:text>
+          </xsl:otherwise>
+        </xsl:choose>
+      </fo:block>
+    </fo:table-cell>
+  </fo:table-row>
+</xsl:template>
+
+<xsl:template match="productionrecap">
+  <xsl:variable name="targets" select="key('id',@linkend)"/>
+  <xsl:variable name="target" select="$targets[1]"/>
+
+  <xsl:if test="count($targets)=0">
+    <xsl:message>
+      <xsl:text>Error: no ID for productionrecap linkend: </xsl:text>
+      <xsl:value-of select="@linkend"/>
+      <xsl:text>.</xsl:text>
+    </xsl:message>
+  </xsl:if>
+
+  <xsl:if test="count($targets)>1">
+    <xsl:message>
+      <xsl:text>Warning: multiple "IDs" for productionrecap linkend: </xsl:text>
+      <xsl:value-of select="@linkend"/>
+      <xsl:text>.</xsl:text>
+    </xsl:message>
+  </xsl:if>
+
+  <xsl:apply-templates select="$target">
+    <xsl:with-param name="recap" select="true()"/>
+  </xsl:apply-templates>
+</xsl:template>
+
+<xsl:template match="lhs">
+  <xsl:apply-templates/>
+</xsl:template>
+
+<xsl:template match="rhs">
+  <xsl:apply-templates/>
+</xsl:template>
+
+<xsl:template match="nonterminal">
+  <xsl:variable name="linkend">
+    <xsl:call-template name="xpointer.idref">
+      <xsl:with-param name="xpointer" select="@def"/>
+    </xsl:call-template>
+  </xsl:variable>
+
+  <xsl:call-template name="check.id.unique">
+    <xsl:with-param name="linkend" select="$linkend"/>
+  </xsl:call-template>
+
+  <xsl:call-template name="check.idref.targets">
+    <xsl:with-param name="linkend" select="$linkend"/>
+    <xsl:with-param name="element-list">production</xsl:with-param>
+  </xsl:call-template>
+
+  <!-- If you don't provide content, you can't point outside this doc. -->
+  <xsl:choose>
+    <xsl:when test="*|text()"><!--nop--></xsl:when>
+    <xsl:otherwise>
+      <xsl:if test="$linkend = ''">
+	<xsl:message>
+	  <xsl:text>Non-terminals with no content must point to </xsl:text>
+	  <xsl:text>production elements in the current document.</xsl:text>
+	</xsl:message>
+	<xsl:message>
+	  <xsl:text>Invalid xpointer for empty nt: </xsl:text>
+	  <xsl:value-of select="@def"/>
+	</xsl:message>
+      </xsl:if>
+    </xsl:otherwise>
+  </xsl:choose>
+
+  <xsl:variable name="href">
+    <xsl:choose>
+      <xsl:when test="$linkend != ''">
+	<xsl:variable name="targets" select="key('id',$linkend)"/>
+	<xsl:variable name="target" select="$targets[1]"/>
+        <xsl:call-template name="object.id">
+          <xsl:with-param name="object" select="$target"/>
+        </xsl:call-template>
+      </xsl:when>
+      <xsl:otherwise>
+	<xsl:value-of select="@def"/>
+      </xsl:otherwise>
+    </xsl:choose>
+  </xsl:variable>
+
+  <fo:basic-link internal-destination="{$href}"
+                 xsl:use-attribute-sets="xref.properties">
+    <xsl:choose>
+      <xsl:when test="*|text()">
+        <xsl:apply-templates/>
+      </xsl:when>
+      <xsl:otherwise>
+        <xsl:choose>
+          <xsl:when test="$linkend != ''">
+            <xsl:variable name="targets" select="key('id',$linkend)"/>
+            <xsl:variable name="target" select="$targets[1]"/>
+            <xsl:apply-templates select="$target/lhs"/>
+          </xsl:when>
+          <xsl:otherwise>
+            <xsl:text>???</xsl:text>
+          </xsl:otherwise>
+        </xsl:choose>
+      </xsl:otherwise>
+    </xsl:choose>
+  </fo:basic-link>
+</xsl:template>
+
+<xsl:template match="rhs/lineannotation">
+  <!--nop-->
+</xsl:template>
+
+<xsl:template match="rhs/lineannotation" mode="rhslo">
+  <xsl:text>/*&#160;</xsl:text>
+  <xsl:apply-templates/>
+  <xsl:text>&#160;*/</xsl:text>
+</xsl:template>
+
+<xsl:template match="constraint">
+  <xsl:call-template name="check.id.unique">
+    <xsl:with-param name="linkend" select="@linkend"/>
+  </xsl:call-template>
+
+  <xsl:call-template name="check.idref.targets">
+    <xsl:with-param name="linkend" select="@linkend"/>
+    <xsl:with-param name="element-list">constraintdef</xsl:with-param>
+  </xsl:call-template>
+
+  <xsl:variable name="href">
+    <xsl:variable name="targets" select="key('id',@linkend)"/>
+    <xsl:variable name="target" select="$targets[1]"/>
+    <xsl:call-template name="object.id">
+      <xsl:with-param name="object" select="$target"/>
+    </xsl:call-template>
+  </xsl:variable>
+
+  <xsl:if test="preceding-sibling::constraint">
+    <fo:inline linefeed-treatment="preserve">&#xA;</fo:inline>
+  </xsl:if>
+  <xsl:text>[&#160;</xsl:text>
+
+  <xsl:choose>
+    <xsl:when test="@role">
+      <xsl:value-of select="@role"/>
+      <xsl:text>: </xsl:text>
+    </xsl:when>
+    <xsl:otherwise>
+      <xsl:variable name="targets" select="key('id',@linkend)"/>
+      <xsl:variable name="target" select="$targets[1]"/>
+      <xsl:if test="$target/@role">
+	<xsl:value-of select="$target/@role"/>
+	<xsl:text>: </xsl:text>
+      </xsl:if>
+    </xsl:otherwise>
+  </xsl:choose>
+
+  <fo:basic-link internal-destination="{$href}"
+                 xsl:use-attribute-sets="xref.properties">
+    <xsl:variable name="targets" select="key('id',@linkend)"/>
+    <xsl:variable name="target" select="$targets[1]"/>
+    <xsl:apply-templates select="$target" mode="title.markup"/>
+  </fo:basic-link>
+  <xsl:text>&#160;]</xsl:text>
+</xsl:template>
+
+<xsl:template match="constraintdef">
+  <xsl:variable name="id"><xsl:call-template name="object.id"/></xsl:variable>
+  <fo:block id="{$id}">
+    <xsl:apply-templates/>
+  </fo:block>
+</xsl:template>
+
+<xsl:template match="constraintdef/title">
+  <fo:block font-weight="bold">
+    <xsl:apply-templates/>
+  </fo:block>
+</xsl:template>
+
+<!-- ==================================================================== -->
+
+</xsl:stylesheet>