OK.
I have
1. a list of chemical compound IDs (10.000 IDs)
2. a xml output of a database with the records for compounds identified by the ID (almost million records) splitted into .xml files by 25.000.

What I want to get certain value buried in the xml tree for an individual compound when the compound`s ID is in my list.
During the weekend I was trying to solve a similar problem, when I was parsing other type xml of output, I wanted buried value from records that were containing some value conforming regex. When regex pattern was found the record was parsed by XML:twig (building only the twigs with value of interest and children_text). This strategy (regex and only then xml:pareser), adviced me by Monks pc88mxer and graff, worked great and in fact the IDs I have now are the result. The only difference now is that the records to be xml-parsed should be selected by extracting relevant value for <compoundID>value</compoundID> by regex and then checking if this value is among 10.000 IDs. So I am looking for most efficient way how to look-up the array of IDs (and deleting already found to speed-up the process). Is there some other strategy?
Tx for reply.

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