__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>

##</code><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>