[xml] automatic xml file update

[francex tiscali it]

Hi,
(sorry for my bad english)
I'm new to libxml and xml:

If I have a generic file xml, for example:

<root>
  <first>
  ...........
  ...........
  </first>
</root>

and an updated DTD file with "second" node definition, how can I do for
automatize a program to add automatically to old xml file <second> node
with eventually default values for attributes?

<root>
  <first>
  ...........
  ...........
  </first>
  <second attr="..">
  ...........
  .............
 </second>
</root>

Can you show me snippet code or link for a program that make it?

Thank you very much,
France

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