Modifying a tag's attribute value of an xml using XML::LibXML in perl

Question

I am trying to modify an attribute value in an XML file using LibXML. Here is the part of my xml file

xmlns="urn:x-xxx:r2:reg-doc:1551-fad.110.05:en:*">
<meta-data><?Pub Dtl?>
<confidentiality class="xxx-internal"/>
<doc-name>XXX</doc-name>
<doc-id>
<doc-no type="registration">XXX</doc-no><language
code="en"/><rev>A</rev>
<date><y>2013</y><m>04</m><d>22</d></date>
</doc-id>
<company-id>
<business-unit></business-unit>
<company-name></company-name>
<company-symbol logotype="XX"></company-symbol>
</company-id>
<title>XXX</title>
<drafted-by>
<person>
<name>XXX</name><signature>XXX</signature>
<location>IN</location><company>XXX</company><department>BC</department>
</person>
</drafted-by>
<approved-by approved="yes">
<person>
<name>XXX</name><signature>XXX</signature>
<location>IN</location><company>XXX</company><department>BC</department>
</person>
</approved-by>

Here is the script i tried.

#!usr/bin/env perl -w
use strict;
use warnings;
use XML::LibXML;
use Data::Dumper;
my $filename="/path/filename.xml";
my $parser=XML::LibXML->new();
my $doc=$parser->parse_file($filename);
my $xpath='/meta-data/approved-by/@approved';
print Dumper $doc->findvalue($xpath);
my ($attr) = $doc->findnodes($xpath);
$attr->setValue('Yes');
print Dumper $doc->findvalue($xpath);

When i execute this script, i get an error message like.

C:\Windows\System32>perl C:\path\perl\sample3.pl
Could not create file parser context for file "/C:/path/1_
1543-CRA 119 1364_2.xml": Result too large at C:\path\perl\sample3.pl line 8

I understand that it is not able to parse, but why? My xml file is a huge one. Is it the problem or is it with my script? please guide me what shld i do. Thanks.

You might need a streaming XML parser that doesn't hold a whole DOM in memory. Often, the XML::Twig module is used in such cases, but it has a completely different API from XML::LibXML. — amon
– amon, Commented Mar 10, 2014 at 15:10
@amon: XML::LibXML::Reader is a pull parser with the same API as XML::LibXML. — choroba
– choroba, Commented Mar 10, 2014 at 15:19
Did you really specify the filename as /C:/path/1_1543-CRA 119 1364_2.xml with a leading slash? — nwellnhof
– nwellnhof, Commented Mar 10, 2014 at 16:24
@amon: I heard about Twig, but i need to install the module. I work on the hub. I need ask the person to copy the Twig tarball, and then download make file, install it, then execute makefile.pl, then install. I thought it is a big task for an admin who wouldnt prefer doing all. They simply say that they couldnt install it. So is there any easy way to install it? — Shahul Hameed
– Shahul Hameed, Commented Mar 10, 2014 at 18:00
@choroba brother, do you mean to say i shd try LibXML::Reader ? — Shahul Hameed
– Shahul Hameed, Commented Mar 10, 2014 at 18:02

nwellnhof · Accepted Answer · 2014-03-12 10:50:40Z

1

If you specified the filename with a leading slash followed by a drive name, try to remove the leading slash. It's possible that the error message from XML::LibXML is misleading and should have been No such file or directory.

edited Mar 12, 2014 at 10:50

answered Mar 10, 2014 at 15:13

nwellnhof

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user4461072 · Accepted Answer · 2015-01-16 09:48:18Z

1

Sorry for the thread necromancy but I have just had this exact same symptom. XML::LibXML reported

"Could not create file parser context for file : Result too large

I was testing three files, one suceeded, two did not. the sucessful file was larger than the failing two and on examination I had made an error in the file path of the failing files.

This message should indeed have been something along the lines of "cannot find file"

If you are experiencing the same check your file path carefully.

Ed.

answered Jan 16, 2015 at 9:48

user4461072

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