No Prefixes after Transformation

Hi there,

I have a (maybe simple) problem when transforming a XML source. My source
ist this one:

  <?xml version="1.0" encoding="ISO-8859-1"?>
  <impl:root xmlns:impl="http://test.de">
    <impl:sub>
    </impl:sub>
  </impl:root>

after transforming the source with this xsl-input:

  <xsl:stylesheet version="1.0"
xmlns:xsl="http://www.w3.org/1999/XSL/Transform">
    <xsl:output method="xml"/>
    <xsl:template match="/">
      <xsl:copy-of select="."/>
    </xsl:template>
  </xsl:stylesheet>

the result ist this:

  <?xml version="1.0" encoding="ISO-8859-1"?>
  <root xmlns:impl="http://test.de">
    <sub>
    </sub>
  </root>

The namespace-prefixes are gone. Why?

I'm using the xslt-processor integrated in Java 5.

Thanks for help. Markus.