Belows what I've done. Firstly, I found out that the inner elements <ID> are processed before the outer ones <AC>. With the twig_handlers, all of them are being processed eventhough, for e.g you only want a listing of <AC>'s. I think I'll have if stmts to check what the users requesting.

The tutorial is too lightweight, xml examples doesn't really deal or include examples attribute checking/extraction. Actually, the xml file used(nba.xml)to simple, hence the simple examples.

Also some XML::XPath usage would be great. This doesn't come thru' even in the developer version document. I think the tutorial should include a comprehensive xml file with attributes. I should show how extract and/or update specific elements (attribs and tags), how to find specific nodes, delete, modify and update em, traverse the doc. Because of the myriad of methods, classes and/or options available to perform a function - in maybe both "normal twiggy way" and xpath way.

Bizza(thandi)

HERE're my attempts at getting to know and understand:
#!/usr/bin/perl

use strict;
use warnings;

use XML::Twig;
# perl test_thandi CCC '@n=AAA'
# perl test_thandi CCC '@n="AAA" or @set="y"'


my( $ac_n_value, $ai_att_cond)= @ARGV;

XML::Twig->new( TwigHandlers =>
   {
#   qq{AC[\@n="$ac_n_value"]/AI[$ai_att_cond]} => \&print_ai_data },
#   qq{AC[\@n="$ac_n_value"]/AI[$ai_att_cond]/ID[\@n=$id_att_cond]} =>
+ \&print_id_data },
#     ID => \&id_print , #list all IDs desc <desc> </desc>
#     AI => \&ai_print ,
     qq{AC}    => \&ac_print,  #list all ACs <desc> </desc>
     qq{AC/AI} => \&ai_print, #list all AIs <desc> </desc>
   },
   pretty_print => 'indented',
#   keep_atts_order => 1,
#   do_not_chain_handlers => 1
) ->parsefile( "custs.xml");


sub ac_print
{
   my( $t, $ac)= @_;
   my $Desc = $ac->first_child('Desc')->text;
   print "AC DESC:   $Desc\n";
   print "=======================================\n";
}

sub ai_print
{
   my( $t, $ai)= @_;
   my $Desc = $ai->first_child('Desc')->text;
   print "AI DESC:   $Desc\n";
   print "----------------------------------\n";
}

sub id_print
{
   my( $t, $id)= @_;
   my $Desc = $id->first_child('Desc')->text;
   my $What = $id->first_child('What')->text;
   my $AR   = $id->first_child('AR')->text;

   print "--> DESC:   $Desc\n";
   print "What:   $What\n";
   print "AR:     $AR\n";
}
[download]

Working with attributes: the att and set_att methods are described in the tutorial: "4.6 A simple HTML+ converter" in http://xmltwig.com/xmltwig/tutorial/yapc_twig_s4.html.

An XPath tutorial is well beyond the scope of the XML::Twig documentation, a good one can be found at zvon.org: http://zvon.org/xxl/XPathTutorial/General/examples.html

The tutorial shows the cut method (it could also show thedelete method and explain the difference between the 2, I have added that to the text), it also explains how to create new elements, and how to navigate the tree.

I have also added an explanation of the order in which the handlers are called.

So I have updated the tutorial based on your remarks.

Thanks for your help.

Thanks a stack. Will check out the updated tutorial(hope it's the same one I've been reading). I've also checkout the XPath tutorial. Problem is that I need to get a grasp of what the twig methods return and how to manipulate em.
thanks