Late to the party, but here is an alternative, using XML::Twig - somewhat less code, but handles only one file at a time:

#!/bin/perl -w
use strict;
use XML::Twig;

my $twig= new XML::Twig( 
            twig_handlers =>                   
               { _all_ => \&Piece_handler , # Call for each 'Program' 
+elemetn
               }
    );          

$twig->parsefile( shift @ARGV );    # build the twig
#-------------------------------------------------
sub Piece_handler{
   my( $twig, $p)= @_;                      # handlers params are alwa
+ys
                                                 # the twig and the el
+ement
     return unless $p->text && $p->text=~/design/;

     print $p->tag , ":",$p->text,"\n";
     #Traverse and print ancestor tags 
     for (my $ancestor = $p->parent; defined $ancestor; $ancestor=$anc
+estor->parent()){
       print "\tParent : ", $ancestor->tag, "\n";
     }
     
      $p->cut;  # This one is processed, delete from tree ..
}
[download]

Produces the following (After adding a proper closing </root> tag to the second example):

$ perl xmlt.pl xmldata2.xml 
para:This is a design XZY document for Project
    Parent : root

$ perl xmlt.pl xmldata.xml 
header:
                   This is a design XZY document for Project
                
    Parent : sect
    Parent : part
    Parent : root
[download]

---

---

Posts are HTML formatted. Put <p> </p> tags around your paragraphs. Put <code> </code> tags around your code and data!

Titles consisting of a single word are discouraged, and in most cases are disallowed outright.

Read Where should I post X? if you're not absolutely sure you're posting in the right place.

Please read these before you post! —

• How do I compose an effective node title?
• How do I post a question effectively?
• Markup in the Monastery

Posts may use any of the Perl Monks Approved HTML tags:

a, abbr, b, big, blockquote, br, caption, center, col, colgroup, dd, del, details, div, dl, dt, em, font, h1, h2, h3, h4, h5, h6, hr, i, ins, li, ol, p, pre, readmore, small, span, spoiler, strike, strong, sub, summary, sup, table, tbody, td, tfoot, th, thead, tr, tt, u, ul, wbr

You may need to use entities for some characters, as follows. (Exception: Within code tags, you can put the characters literally.)

	For:		Use:
	&		&
	<		&lt;
	>		&gt;
	[		&#91;
	]		&#93;

Link using PerlMonks shortcuts! What shortcuts can I use for linking?

See Writeup Formatting Tips and other pages linked from there for more info.