xml - If "match" else -

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in xslt match nodes using following command

<xsl:template match="*[local-name() = 'proposal']/*[local-name() = 'applicationdata']">

which nodes from

<?xml version="1.0" encoding="utf-8"?><?xfa generator="xfa2_4" apiversion="2.8.9029.0"?>     <xdp:xdp xmlns:xdp="http://ns.adobe.com/xdp/" timestamp="2013-03-01t09:48:58z" uuid="3e3468da-104d-4532-8077-0dc001ca166b">        <xfa:datasets xmlns:xfa="http://www.xfa.org/schema/xfa-data/1.0/">           <xfa:data>              <proposal xmlns="http://www.govtalk.gov.uk/planning/oneappproposal-2006" version="">                  <oneapp:applicationdata xmlns:oneapp="http://www.govtalk.gov.uk/planning/oneappproposal-2006">                         <oneapp:treeshedgeswales/>                         <oneapp:otherlowcarbonenergy/>                  </oneapp:applicationdata>              </proposal>          ...

matching

<oneapp:applicationdata xmlns:oneapp="http://www.govtalk.gov.uk/planning/oneappproposal-2006">       <oneapp:treeshedgeswales/>       <oneapp:otherlowcarbonenergy/>  </oneapp:applicationdata>

how determine whether applicationdata existed, , if not, insert it?

you need add logic template matched 'proposal' element

<xsl:template match="*[local-name() = 'proposal']">

then, write xsl:if statement, so:

<xsl:if test="not(*[local-name() = 'applicationdata'])">    <oneapp:applicationdata xmlns:oneapp="http://www.govtalk.gov.uk/planning/oneappproposal-2006">       <oneapp:treeshedgeswales/>       <oneapp:otherlowcarbonenergy/>    </oneapp:applicationdata> </xsl:if>

you need wrap in xsl:copy if wanted retain proposal element.

if didn't have existing template matching proposal in xslt, add test template match itself

<xsl:template match="*[local-name() = 'proposal'][not(*[local-name() = 'applicationdata'])]">    <xsl:copy>       <oneapp:applicationdata xmlns:oneapp="http://www.govtalk.gov.uk/planning/oneappproposal-2006">           <oneapp:treeshedgeswales/>           <oneapp:otherlowcarbonenergy/>       </oneapp:applicationdata>    </xsl:copy> </xsl:template>

as michael.hor257k mentioned in comments, cleaner if declared namespaces in xslt, , used namespace prefixes in matching....

<xsl:stylesheet xmlns:xsl="http://www.w3.org/1999/xsl/transform" version="1.0"      xmlns:oneapp="http://www.govtalk.gov.uk/planning/oneappproposal-2006">  <xsl:template match="oneapp:proposal[not(oneapp:applicationdata)]">    <xsl:copy>       <oneapp:applicationdata>          <oneapp:treeshedgeswales/>          <oneapp:otherlowcarbonenergy/>       </oneapp:applicationdata>    </xsl:copy> </xsl:template>

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