Select Code to Download

/p1:root
/p1:root/p1:foo[1]
...

Prefix definitions:
p1: http://www.example.org/tooty

/*
/*/*[1]
/*/*[2]
/*/*[3]
/*/*[4]

use strict;
use warnings;
...
my $doc = $parser->parse_fh(*STDIN);

visit_doc($doc);