Require Help in XSLT coding - xslt

Question

I am new to XSLT .Kindly help me with the below query :
My Source XML:
<?xml version="1.0" encoding="UTF-8"?>
<ns1:Header1 xmlns:ns1="urn:src:abc">
<Header2>
<Header3>
<field1>1.1.2017</field1>
<field2>12</field2>
<field3> </field3>
</Header3>
</Header2>
</ns1:Header1>
Target/Expected XML
<?xml version="1.0" encoding="UTF-8"?>
<ns2:Header1 xmlns:ns2="urn:tar:abc" xmlns:v1="def.v1">
<Header2>
<v1:Header3>
<field1>1.1.2017</field1>
<field2>12</field2>
<field3> </field3>
</v1:Header3>
</Header2>
</ns2:Header1>
And also i need to remove the space/blank between the tag filed3 ( Field3 value sometimes will be blank)
I am using the below code for Transformation
<xsl:stylesheet xmlns:xsl="http://www.w3.org/1999/XSL/Transform"
xmlns:xs="http://www.w3.org/2001/XMLSchema"
exclude-result-prefixes="xs" version="2.0">
<xsl:template match="*">
<ns2:Header1 xmlns:ns2="urn:tar:abc" xmlns:v1="def.v1">
<Header2>
<xsl:copy-of select="//Header3"/>
</Header2>
</ns2:Header1>
</xsl:template>
</xsl:stylesheet>
I am not able to achieve my Target XML. Kindly help
Many thanks in advance
Regards,
Pavi

Answer 1

Your current template matches * which will match any element, but really you only want it to match the root element.
Additionally, as you want to change Header3 from being in no namespace, to being in the "def.v1" namespace, you should be making use of xsl:apply-templates, not xsl:copy-of
<xsl:template match="/*">
<ns2:Header1 xmlns:ns2="urn:tar:abc" xmlns:v1="def.v1">
<xsl:apply-templates />
</ns2:Header1>
</xsl:template>
You would then need a template matching Header3 to change the namespace
<xsl:template match="Header3" xmlns:v1="def.v1">
<v1:Header3>
<xsl:apply-templates />
</v1:Header3>
</xsl:template>
You would then just need the identity template to copy all other nodes without changes.
Try this XSLT
<xsl:stylesheet xmlns:xsl="http://www.w3.org/1999/XSL/Transform"
xmlns:xs="http://www.w3.org/2001/XMLSchema"
exclude-result-prefixes="xs" version="2.0">
<xsl:output method="xml" indent="yes" />
<xsl:template match="/*">
<ns2:Header1 xmlns:ns2="urn:tar:abc" xmlns:v1="def.v1">
<xsl:apply-templates />
</ns2:Header1>
</xsl:template>
<xsl:template match="Header3" xmlns:v1="def.v1">
<v1:Header3>
<xsl:apply-templates />
</v1:Header3>
</xsl:template>
<xsl:template match="#*|node()">
<xsl:copy copy-namespaces="no">
<xsl:apply-templates select="#*|node()"/>
</xsl:copy>
</xsl:template>
</xsl:stylesheet>
See it in action at http://xsltransform.net/jz1PuQb