[xsl] xsl:element name AVT

[Jack Matheson <jack@xxxxxxxxxxxxxx>]

I'm getting some unexpected results in the following stylesheet, and was 
wondering if anyone could lend some insight:

<?xml version="1.0"?>
<xsl:stylesheet version="1.0" 
xmlns:xsl="http://www.w3.org/1999/XSL/Transform"; xmlns:a="aa" xmlns:b="bb">
  <xsl:template match="/">
     <xsl:element name="{'b:blah'}"/>
  </xsl:template>
</xsl:stylesheet>

When the name AVT gets expanded, I expect the prefix 'b' to be in scope 
at this point in the stylesheet.
Saxon 8.2 gives this error:

Error at xsl:element on line 4 of file:elem_avt_ns.xsl:
 Element name is not a valid QName

Xalan appears to give the result I expect...is this another case of 
"assuming XSLT 1.0 semantics in an XSLT 2.0 environment" ?