xpath or alternatives

[Richard Jones <rich@annexia.org>]

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