Just for future reference, here's a solution (proper one), that uses XML::Rules.

use strict;
use warnings;
use XML::Rules;

my $rules =XML::Rules->new(
    style => 'parser',
    rules => {
        'inline-formula'  => sub {
            # (tag, attrs, context, parents, parser)
            open my $OUT, '>:utf8', $_[1]{id} . ".xml"; # open file na
+med after the contents of the id attribute
            print $OUT $_[4]->toXML($_[0], $_[1]); # serialize the tag
+ with attributes
            close $OUT;
        },
        '_default' => 'raw', # make sure we keep everything else intac
+t
    }
);

$rules->parse( *DATA );

__DATA__
<data>
<inline-formula id="ieqn-1"><alternatives><mml:math display="inline"><
+mml:mi>&#964;</mml:mi></mml:math></alternatives></inline-formula>

<inline-formula id="ieqn-2"><alternatives><mml:math display="inline"><
+mml:mi>&#964;</mml:mi></mml:math></alternatives></inline-formula>

<inline-formula id="ieqn-3"><alternatives><mml:math display="inline"><
+mml:mi>&#964;</mml:mi></mml:math></alternatives></inline-formula>
</data>

[download]

Jenda
Enoch was right!
Enjoy the last years of Rome.

In reply to Re: extract tag form xml file by Jenda
in thread extract tag form xml file by Murugan

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.