I am coping nodes & subnodes of single element to output using <xsl:copy-of and i need to add prefix ns0: to those nodes using xslt

is ns0 the namespace?

You're thinking in terms of the serialized output, not in terms of the nodes on the result tree. As far as the tree is concerned, you don't want to add a prefix, you want to change the names of the nodes (putting them in a different namespace). xsl:copy-of creates an identical copy, you can't make any changes such as renaming. So you need to walk the tree modifying each node to put it in a different namespace, which you typically do with

<xsl:element name="ns0:{local-name()}" namespace="the-new-uri"/>

Here "ns0" is just a hint to the processor about your preferred prefix.

Michael Kay
http://www.saxonica.com/
Author, XSLT Programmer's Reference and XPath 2.0 Programmer's Reference

Thanks Michael , so after doing <xsl:copy-of , I should call another xslt to Traverse thru each Nodes to add prefix ns0:?

No, you do that instead of the copy-of. It's a modified identity transform, a classic XSLT coding pattern:

<xsl:template match="*">
  <xsl:element name="ns0:{local-name()}" namespace="the-new-uri"/>
  <xsl:copy-of select="@*"/>
  <xsl:apply-templates/>
  </xsl:element>
</xsl:template>

gives you a copy of the tree in which the names of all elements have been changed to be in the new namespace.

Michael Kay
http://www.saxonica.com/
Author, XSLT Programmer's Reference and XPath 2.0 Programmer's Reference

<?xml version="1.0" encoding="UTF-16"?>
<xsl:stylesheet xmlns:xsl="http://www.w3.org/1999/XSL/Transform"
    xmlns:msxsl="urn:schemas-microsoft-com:xslt"
    xmlns:ns0="http://test/2004-08-02" >
  <xsl:output omit-xml-declaration="yes" method="xml" version="1.0" />

  <xsl:template match="/">
    <xsl:apply-templates select="/ns0:Order" />
  </xsl:template>

  <xsl:template match="/ns0:Order">
    <ns1:KOrder>
       <Order>
      <xsl:copy-of select="./@*" />
      <xsl:copy-of select="./*" />
      </Order>

    </ns1:KOrder>
  </xsl:template>
</xsl:stylesheet>

Yes I have already tried the above lines of code but it did not work. I have attached the xslt above. I wanted to copy all nodes and subnodes under <Order> element in the input and add namespace prefix ns0: to Output all copied nodes and subnodes

That doesn't look anything like the code Michael suggested.

--

Joe (Microsoft MVP - XML)

Yes Joe , I meant I have already tried the michael code before posting this issue here, it did not work or I donot know whether I am missing something and then I changed to the code above which is working i.e copies all nodes and subnodes.
Joe , do I need to use michael code in for-each looping thru each node in input?
Can you help me in modifying the xslt above

If my code didn't work, then either it was wrong or you applied it wrongly. Either way, chucking it to one side without any attempt at debugging, writing your own code which doesn't address the requirement at all, and then asking for more help without giving any clues as to where you hit problems, is hardly a way forward.

It's a characteristic of good programmers that they solve problems, they don't give up and try something else.

Michael Kay
http://www.saxonica.com/
Author, XSLT Programmer's Reference and XPath 2.0 Programmer's Reference

Michael
your code should be right, might be I am applying it wrongly. when I used your code before it was copying only the text not the text. I have backup code using c# which is working .
But I wanted to do it in xslt.
I will try to figure out myself.
Thanks for the help

Michael thanks for the help,