Re: Renumbering ID values for XML tags

Hi rsriram,

You can do that using XML::Twig. Take a look at 'add_id' method in that. From XML::Twig documentation,

add_id 

Add an id to the element.

The id is an attribute (id by default, see the id option for XML::Twig
+ new to change it. Use an id starting with # to get an id that's not 
+output by print, flush or sprint) that allows you to use the elt_id m
+ethod to get the element easily.

set_id_seed ($prefix) 

by default the id generated by add_id is twig_id_<nnnn>, set_id_seed c
+hanges the prefix to $prefix and resets the number to 1
[download]

Here is one way to do it.

use strict;
use XML::Twig;

my $string = '<xml>
<p>here the paragraph comes</p>
<p>here the paragraph comes</p>
<p>here the paragraph comes</p>
</xml>';

my $twig = new XML::Twig(
                    
        twig_handlers => {
    
           p => sub { $_->add_id() }, #insert element id

                               },
        pretty_print => 'indented' #print format
);

$twig->set_id_seed( '' );

$twig->parse($string);

$string = $twig->sprint;

print $string;

output:
-------
<xml>
  <p id="1">here the paragraph comes</p>
  <p id="2">here the paragraph comes</p>
  <p id="3">here the paragraph comes</p>
</xml>
[download]

updated: added set_id_seed instead of regex. derby thanks :)

Prasad

Comment on Re: Renumbering ID values for XML tags Select or Download Code

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Re^2: Renumbering ID values for XML tags by derby (Abbot) on Jun 23, 2006 at 12:01 UTC
No need for the regex, just: `$twig->set_id_seed( '' );` [download] before the parse call. -derby	[reply] [d/l]
Re^2: Renumbering ID values for XML tags by rsriram (Hermit) on Jun 23, 2006 at 13:46 UTC
Thank you for your reply Prasad, I was quite successful in inserting id to the XML file using the `XML::Twig`. But I do not want the XML to be parsed. My XML file may not be structured. The code I have with me... `#use strict;` `use XML::Twig;` `my $string = '<xml><p>This is a string</p><p>This is a string</p><p>This is a string</p></xml>';` `my $twig = new XML::Twig(` `twig_handlers => {` `p => sub { $_->add_id() },` `},` `pretty_print => 'indented' #print format` `);` `$twig->set_id_seed( '' );` `$twig->parse($string);` `$string = $twig->sprint;` `print $string;` Sriram	[reply] [d/l] [select]
Re^3: Renumbering ID values for XML tags by prasadbabu (Prior) on Jun 23, 2006 at 14:03 UTC
Hi rsriram, I think if your XML file is not well-formed you cannot process your file with XML::Twig. Instead you can do using regex. Before that you have to select the required `<p>` for processing id. After selecting required paragraphs `<p>`, you can do something like this. `use strict; use XML::Twig; my $string = '<xml> <p>here the paragraph comes</p> <p>here the paragraph comes</p> <p>here the paragraph comes</p> <p>here the paragraph comes</p> </xml>'; my $i =1; $string =~ s/<p>/'<p id="'.$i++.'">'/egs; print $string; output: ------- <xml> <p id="1">here the paragraph comes</p> <p id="2">here the paragraph comes</p> <p id="3">here the paragraph comes</p> <p id="4">here the paragraph comes</p> </xml>` [download] Prasad	[reply] [d/l] [select]