In scope namespaces of literal result elements are not always copied
to the result.

XSLT 1.0 (7.1.1):
"The created element node will also have a copy of the namespace nodes
that were present on the element node in the stylesheet tree with
the exception of..."

The current implementation does not keep track of in-scope namespaces
of all literal result elements.

It seems that a fix for this was already tried: the "inheritedNs" field
on a xsltTemplate inserts namespace nodes which were declared
in the descendant-or-self axis of an xsl:template.
But this does not cover all the cases we need to consider.

In the following examples, the result element "bar" needs to have the
namespace "urn:test:foo" in scope.

Example A
---------
<xsl:stylesheet version="1.0"
  xmlns:xsl="http://www.w3.org/1999/XSL/Transform"  
  xmlns:foo="urn:test:foo"> 
  <xsl:output indent="yes"/>

  <xsl:template match="/">
    <xsl:element name="foo">
      <bar/>
    </xsl:element>
  </xsl:template>     

</xsl:stylesheet>

Result of Libxslt (error):
<?xml version="1.0"?>
<foo>
  <bar/>
</foo>

Expected result:
<?xml version="1.0"?>
<foo>
  <bar xmlns:foo="urn:test:foo"/>
</foo>

Example B
---------
<?xml version="1.0"?>
<xsl:stylesheet version="1.0"
  xmlns:xsl="http://www.w3.org/1999/XSL/Transform"  
  xmlns:foo="urn:test:foo"> 
  <xsl:output indent="yes"/>  
  
  <xsl:variable name="bar">
    <bar/>
  </xsl:variable>

  <xsl:template match="/">
    <xsl:copy-of select="$bar"/>
  </xsl:template>     

</xsl:stylesheet>

Result of Libxslt (error):
<?xml version="1.0"?>
<bar/>

Expected result:
<?xml version="1.0"?>
<bar xmlns:foo="urn:test:foo"/>