Conformance tests for string function errata

Hi all,

It looks like we missed some of the latest errata for string functions.  In
particular, the behavior of substring-after() and substring-before() when
the second parameter is an empty string.  Here's a quick-and-dirty
stylesheet, to illustrate.

   <?xml version="1.0" encoding="UTF-8"?>
   <xsl:stylesheet version="1.0"
   xmlns:xsl="http://www.w3.org/1999/XSL/Transform";>
     <xsl:output method="xml" encoding="UTF-8"/>

     <xsl:template match="/">
       <out>
         <xsl:if test="starts-with('foo', '') = true()">
          <xsl:text>&#xA;starts-with('foo', '') = true() passed</xsl:text>
         </xsl:if>
         <xsl:if test="contains('foo', '') = true()">
          <xsl:text>&#xA;contains('foo', '') = true() passed</xsl:text>
         </xsl:if>
         <xsl:if test="substring-after('foo', '') = 'foo'">
          <xsl:text>&#xA;substring-after('foo', '') = 'foo'
   passed</xsl:text>
         </xsl:if>
         <xsl:if test="substring-before('foo', '') = ''">
          <xsl:text>&#xA;substring-before('foo', '') = '' passed</xsl:text>
         </xsl:if>
        <xsl:text>&#xA;</xsl:text>
       </out>
     </xsl:template>

   </xsl:stylesheet>

Can someone come up with some better test cases for inclusion in the
conformance suite?

Thanks!

Dave