Some note on components

• lifter : descriptive functions - a bit of user friendly Prolog
• dirtree : a declarative interface to file system (xml at work), and a bit of ftp
• lag : linear aggregation - just a sketch by now, showing how efficient aggregation can be performed in Prolog

About lifter, I can't resist...

here is part of a comment from SWI-Prolog mailing list (original list no more available, see http://swi-prolog.996271.n3.nabble.com/Renaming-map-dict-class-type-tp13585p13742.html),

explaining what lifter is.

From the very first lifter' users:

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With lifter, the clause

longer(A,B) :-
    length(A,º) > length(B,º).

is expanded to

longer(A, B) :-
    length(A, C),
    length(B, D),
    C > D.

I like that this approach satisfies the desire for expressions that "evaluate in place" but keeps the flexibility and potent, multi-directional functionality of prolog relations.

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License LGPL 2.1 Author Capelli Carlo