[xsl] How to move the namespaces onto the root element when there is a namespace prefix that is bound to different namespaces?

["Costello, Roger L." <costello@xxxxxxxxx>]

Hi Folks,

I found this wonderful code [1] from Michael Kay to move the namespace
declarations up onto the root element:

  <xsl:template match="/*">
    <xsl:copy>
      <xsl:copy-of select="@*, //namespace::*, child::node()"/>
    </xsl:copy>
  </xsl:template>

That works great, provided the XML document doesn't have the same namespace
prefix bound to different namespaces. For example, it fails on this XML
document:

<Test xmlns="A">
    <ns1:element xmlns:ns1="B">Hello</ns1:element>
    <ns1:element xmlns:ns1="C">C</ns1:element>
</Test>

Notice that the namespace prefix, ns1, is bound to two different namespaces.

Applying the XSLT program to the XML document results in this  error:

    Cannot create two namespace nodes with the same
    prefix mapped to different URIs (prefix=ns1, URI=C,
    URI=B)

How do I move the namespace declarations up onto the root element, while
taking in account that the XML document may contain a namespace prefix that is
bound to different namespaces?

/Roger

[1] http://www.mhonarc.org/archive/html/xsl-list/2009-10/msg00153.html