XML::LibXML to the rescue (again): 
#!/usr/bin/perl

use strict;
use warnings;

use File::Find::Rule;
use XML::LibXML;

# get a list of target files
my $input_folder = 'input'; # whatever
my @files = File::Find::Rule->file->in( $input_folder );

# initiate XML parser
my $parser = XML::LibXML->new;
$parser->expand_entities( 0 ); # leave entities alone

# go through target files, collecting elements of interest
my @wanted;

foreach my $file ( @files ) {

    # parse XML
    my $dom = $parser->parse_file( $file ); # input

    # select and store all top level elements
    push @wanted, $dom->documentElement->findnodes( './*' ); 
}

# make a new document
my $new = XML::LibXML::Document->new( '1.0', 'UTF-8' );

# add root element
my $root = XML::LibXML::Element->new( 'xml' );
$new->addChild( $root );

# add the inner elements we've collected
$root->addChild( $_ ) for @wanted;

# output
print $new->toString;

[download]

In reply to Re: Conatenating XML files by un-chomp
in thread Concatenating XML files by moritz

Title:
Use:  <p> text here (a paragraph) </p>
and:  <code> code here </code>
to format your post, it's "PerlMonks-approved HTML":


  • 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! —
  • 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:
    & &amp;
    < &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.