<?xml version="1.0"?>
<xsl:stylesheet
   xmlns:xsl="http://www.w3.org/1999/XSL/Transform" version="1.0"
   
   xmlns:err="ns://www.error.com/">

<?spec xslt#namespace-aliasing?>
<?error XTSE0815?>
  <!-- Undeclared default stylesheet prefix -->
  
<xsl:namespace-alias stylesheet-prefix="#default" result-prefix="err"/>
<xsl:output indent="yes"/>  


<xsl:template match = "/">
  <xsl:param name="c" select="'banana'"/>
  <out>
    <xsl:element name="{$c}">
      <yyy/>
    </xsl:element>
  </out>
</xsl:template>

</xsl:stylesheet>