Thanks for the comments! A RDBMS it will be. I will definitely give XML::Twig a try. It has been on my "to do" list for some time.

Wrt the validation it ranges from simple (i.e. number or date in a certain range) to complex (Right- Ascension/Declination of a satellite orbiting some celestial body at a specific time is “correct”). It cannot be captured by XML Schema or any other schema language. We have lots of IDL code and third party libraries to validate the data.

In reply to Re^2: updating big XML files by dHarry
in thread updating big XML files by dHarry

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