From ef389472d8ab3b14dfe10c6588a423d4e5084d1a Mon Sep 17 00:00:00 2001
From: David Cramer <david@thingbag.net>
Date: Mon, 15 Sep 2008 19:18:09 +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/html/footnote.xsl | 9 +++++++++
 1 file changed, 9 insertions(+)

diff --git a/xsl/html/footnote.xsl b/xsl/html/footnote.xsl
index 9f941b917..0c03df5e1 100644
--- a/xsl/html/footnote.xsl
+++ b/xsl/html/footnote.xsl
@@ -51,6 +51,15 @@
   <xsl:variable name="targets" select="key('id',@linkend)"/>
   <xsl:variable name="footnote" select="$targets[1]"/>
 
+  <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:variable name="target.href">
     <xsl:call-template name="href.target">
       <xsl:with-param name="object" select="$footnote"/>
-- 
2.40.0