I don't think you defined your problem well enough to get detailed advice.

Some points are quite unclear:

• What is Esperanto ? (I assume you don't mean the spoken language)
• Did you actually write code that parses Java ? Using a module ? A full parser or some partial regex-hack ?

Anyways, an intermediate representation for Java code, like for any code really, is a syntax tree. For XML, a good internal representation is the one used by Perl's modules - if your XML isn't too sophisticated, the HoAoH(...) approach of XML::Simple may be what you're looking for.

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