What are logical and path queries

Posted by NomeN on Stack Overflow See other posts from Stack Overflow or by NomeN
Published on 2010-03-13T00:45:26Z Indexed on 2010/03/13 0:47 UTC
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I'm reading a paper which mentions that a language for refactoring has three specific requirements.

functional features (like ML)
logical queries (like Datalog)
path queries (like Datalog)

I know what they mean by functional features, but I'm not totally clear on the latter two and can't find a clear explanation either. Although I have a good idea after what I could find on the subjects, I need to be sure so here goes:

Could the SO-community please clearly explain to me what logical queries and path queries are?

Or at the very least what the people from the paper meant?

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