From 687c5907c8fbdeba8bf608e270237d71b06de169 Mon Sep 17 00:00:00 2001
From: David Cramer <david@thingbag.net>
Date: Mon, 15 Sep 2008 19:17:18 +0000
Subject: [PATCH] Added a check to confirm that a footnoteref's linkend points
 to a footnote. Stylesheets stop processing if not and provide a useful error
 message.

---
 xsl/fo/footnote.xsl | 10 ++++++++++
 1 file changed, 10 insertions(+)

diff --git a/xsl/fo/footnote.xsl b/xsl/fo/footnote.xsl
index ff4beb09e..42768faa4 100644
--- a/xsl/fo/footnote.xsl
+++ b/xsl/fo/footnote.xsl
@@ -59,6 +59,16 @@
 
 <xsl:template match="footnoteref">
   <xsl:variable name="footnote" select="key('id',@linkend)"/>
+
+  <xsl:if test="not(local-name($footnote) = 'footnote')">
+   <xsl:message terminate="yes">
+ERROR: A footnoteref element has a linkend that points to an element that is not a footnote. 
+Typically this happens when an id attribute is accidentally applied to the child of a footnote element. 
+target element: <xsl:value-of select="local-name($footnote)"/>
+linkend/id: <xsl:value-of select="@linkend"/>
+   </xsl:message>
+  </xsl:if>
+
   <xsl:call-template name="format.footnote.mark">
     <xsl:with-param name="mark">
       <xsl:apply-templates select="$footnote" mode="footnote.number"/>
-- 
2.40.0