XML is simply a way to format data in the form of containers, or a tree. For example, the clogp verbose output from the pcmodels program could be formatted in XML as

<?xml version="1.0" standalone="yes"?>

    <Synopsis>All fragments measured</Synopsis>

      <LCD>6 aliphatic isolating carbons</LCD>
      <LCD>14 hydrogens on isolating carbons</LCD>
      <LCD>4 chain and 0 alicyclic (net)</LCD>

More information on XML can be obtained from
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