Hi, I just changed the input as below.

__DATA__
<enhancement>
<descriptorgroup>
<descriptors type="MED" controlled="y">
<descriptor>
<mainterm weight="a">plague</mainterm>
<mainterm>disease</mainterm>
<mainterm>pestilence</mainterm>
<link>f</link>
<link>C</link>
<link>M</link>
</descriptor>
</descriptors>
<descriptors type="DRG" controlled="y">
<mainterm>panadol</mainterm>
<mainterm weight="a">zorro</mainterm>
<mainterm>xenon</mainterm>
<mainterm weight="a">aspirin</mainterm>
<link>b</link>
<link>P</link>
<link>z</link>
</descriptors>
</descriptorgroup>
</enhancement>

[download]

Most of it is going fine, but one thing I noticed is that it’s moving the position of “mainterm” as well. This won’t work because the xsd/dtd says that <mainterm> must come first, and then the <linkterm>s which are related to it. What is happening at the moment is that it is arrange ALL the tags alphabetically, <mainterm> and <linkterm>. How can this be controlled by the code? 

<enhancement>
  <descriptorgroup>
    <descriptors controlled="y" type="DRG">
      <link>P</link>
      <mainterm weight="a">aspirin</mainterm>
      <link>b</link>
      <mainterm>panadol</mainterm>
      <mainterm>xenon</mainterm>
      <link>z</link>
      <mainterm weight="a">zorro</mainterm>
    </descriptors>
    <descriptors controlled="y" type="MED">
      <descriptor>
        <link>C</link>
        <link>M</link>
        <mainterm>disease</mainterm>
        <link>f</link>
        <mainterm>pestilence</mainterm>
        <mainterm weight="a">plague</mainterm>
      </descriptor>
    </descriptors>
  </descriptorgroup>
</enhancement>

[download]

In reply to Re^3: twig inbuilt methods to sort whole xml tree by bharathinc
in thread twig inbuilt methods to sort whole xml tree by bharathinc

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