There are a few projects out here: xtisp http://www.xtisp.org
xstream http://yquem.inria.fr/~frisch/xstream/ and of course the good old cduce/xduce/ocamlduce. All in all naive querying is not hard and tree automata: (e.g.) http://www.grappa.univ-lille3.fr/~filiot/tata/ can provide a good middle ground between efficiency and simplicity. The problem you might run into is that XML is a tricky format to deal with and some of these tools will choke up on complex files (namespaces,switching character encoding, weird entities in the DTD etc..). Till P.S.: Alain has a good paper on how to compile queries (as done in cduce). I am just too lazy to look for it. On Mon, Sep 28, 2009 at 8:48 AM, Yaron Minsky <ymin...@gmail.com> wrote: > I don't have the code in front of me, but I've done something like this > using the list monad. i.e., using bind (= concat-map) and map chained > together, along with a couple operators I wrote for lifting bits of XML > documents into lists, by say returning the subnodes of the present node as a > list. > > It was quite effective. I got the inspiration from a similar tool we have > for navigating s-expressions, which we should release at some point... > > Yaron Minsky > > On Sep 28, 2009, at 8:17 AM, Richard Jones <r...@annexia.org> wrote: > >> >> I need to do some relatively simple extraction of fields from an XML >> document. In Perl I would use xpath, very specifically if $xml was an >> XML document[1] stored as a string, then: >> >> my $p = XML::XPath->new (xml => $xml); >> my @disks = $p->findnodes ('//devices/disk/source/@dev'); >> push (@disks, $p->findnodes ('//devices/disk/source/@file')); >> >> This isn't type safe or pretty, but it is very easy to use for quick >> and dirty extraction. >> >> What is the OCaml equivalent for this sort of code? >> >> Alain Frisch has a library called Xpath >> (http://alain.frisch.fr/soft.html#xpath), but unfortunately this >> relies on the now obsolete wlex program. >> >> Is there a completely alternative way to do this? Better still, in 3 >> lines of code?? >> >> Rich. >> >> [1] for XML doc, see: http://libvirt.org/formatdomain.html >> >> -- >> Richard Jones >> Red Hat >> >> _______________________________________________ >> Caml-list mailing list. Subscription management: >> http://yquem.inria.fr/cgi-bin/mailman/listinfo/caml-list >> Archives: http://caml.inria.fr >> Beginner's list: http://groups.yahoo.com/group/ocaml_beginners >> Bug reports: http://caml.inria.fr/bin/caml-bugs > > _______________________________________________ > Caml-list mailing list. Subscription management: > http://yquem.inria.fr/cgi-bin/mailman/listinfo/caml-list > Archives: http://caml.inria.fr > Beginner's list: http://groups.yahoo.com/group/ocaml_beginners > Bug reports: http://caml.inria.fr/bin/caml-bugs > _______________________________________________ Caml-list mailing list. Subscription management: http://yquem.inria.fr/cgi-bin/mailman/listinfo/caml-list Archives: http://caml.inria.fr Beginner's list: http://groups.yahoo.com/group/ocaml_beginners Bug reports: http://caml.inria.fr/bin/caml-bugs
