This is actually a namespace node, not an attribute.
If you mean add to your result using xslt, simply put the node in your stylesheet node, and it will get copied over.
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
Thanks for replying
I don't want to copy it over but to generated it using xslt. The code i wrote is as follows:
<xsl:attribute name="xmlns:xsi" namespace="xmlns">
<xsl:text>http://www.w3.org/2001/XMLSchema-instance</xsl:text>
</xsl:attribute>
But the i output i am getting is breaked as follows
<Update xmlns:ns0="xmlns" ns0:xsi="http://www.w3.org/2001/XMLSchema-instance">
When i am trying to validate it against schema it is not getting validated.