I am having difficulties trying to figure out how to append the text from one Child Node to that of another before moving to the next parent.

I have tried using a few different XML libraries and am currently testing XPath. That is before I decide to just write my own parser which I would rather not do right now.

The following is a sample of the XML page 

 
<xdoc>
 <MsgSigs>
   <MsgSig>
     <Description>TSC1 - Torque/Speed Cntrl 1</Description>
     <Key>ln1</Key>
     <XtdFrame>True</XtdFrame>
     <NetworkKey>net0</NetworkKey>
     <MsgSignals>
     </MsgSignals>
   </MsgSig>
   <MsgSig>
     <Description>TSC1 - Torque/Speed Cntrl 1</Description>
     <Key>ln2</Key>
     <XtdFrame>True</XtdFrame>
     <NetworkKey>net0</NetworkKey>
     <MsgSignals>
        <Signal>
          <Description>0_SPN695 Eng. Override </Description>
          <Key>sig695</Key>
          <ValueType>1</ValueType>
        </Signal>
     </MsgSignals>
   </MsgSig>
</xdoc>

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What I am trying to do is loop through the MsgSig nodes and take the key (eg, ln1, ln2) and append this key to the Description. Note: I am not wanting to go into the Signal Node (why I ruled out DOM). The result would look something like this 

 
<xdoc>
 <MsgSigs>
   <MsgSig>
     <Description>TSC1 - Torque/Speed Cntrl 1 (ln1)</Description>
     <Key>ln1</Key>
     <XtdFrame>True</XtdFrame>
     <NetworkKey>net0</NetworkKey>
     <MsgSignals>
     </MsgSignals>
   </MsgSig>
   <MsgSig>
     <Description>TSC1 - Torque/Speed Cntrl 1 (ln2)</Description>
     <Key>ln2</Key>
     <XtdFrame>True</XtdFrame>
     <NetworkKey>net0</NetworkKey>
     <MsgSignals>
        <Signal>
          <Description>0_SPN695 Eng. Override </Description>
          <Key>sig695</Key>
          <ValueType>1</ValueType>
        </Signal>
     </MsgSignals>
   </MsgSig>
</xdoc>

[download]

As I mentioned I am currently using XPath and as a test have made it to here and here is where I sit. 

#!/usr/bin/perl -w 

use XML::XPath;
use Data::Dumper;

$file = "test.xml";
$xp = XML::XPath->new(filename => $file);

@nodes = $xp->findnodes("/xdoc/MsgSigs/MsgSig");

foreach (@nodes) {
   $key = $_->findvalue('Key');
   $descr = $_->findvalue('Description');
   $text = $descr . "(" . $key . ")";

   # A setValue would be awesome right about now or an 
   #  appendtext
   
   $_->
   print $_->findvalue('Description'), "\n";
}

#print out to xml file

[download]

Any help would be very much appreciated.

D. Thomas

In reply to Appending Text of One XML Node to that of the Other by thomasd

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