What do you have so far?

#!/usr/bin/perl
use strict;
use warnings;

use XML::Simple;
use Data::Dumper ;

my $xml_Event = XMLin('EventDescription.xml');

warn "$xml_Event->{Event};
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Hello bhushanQA,

The XML you’ve shown is not valid, as the <Event> element has no closing tag. When that is added, reading the XML is fairly straightforward. I’m not sure exactly what you’re trying to do; this is my best guess:

#! perl
use strict;
use warnings;
use XML::Simple;

my $xml       = do { local $/; <DATA>; };
my $xml_Event = XMLin($xml);

for (keys %{ $xml_Event->{attribute} })
{
    printf "'%s' is %srequired\n", $_,
           $xml_Event->{attribute}{$_}{required} =~ /true/i ? '' : 'no
+t ';
}

__DATA__

<Event name="Constants" id="0" ui-visible="0" version="0" serviceKey="
+0" rateTableName="">
    <properties>
        <visible> false </visible>
    </properties>
    <attribute identifier="00">
        <name> session_id </name>
        <type> string </type>
        <required> true </required>
        <ilog>
            <alternate> session id in string format </alternate>
            <visible> false </visible>
        </ilog>
    </attribute>
    <attribute identifier="01">
        <name> volume </name>
        <type> int </type>
        <required> false </required>
        <ilog>
            <alternate> the volume </alternate>
            <visible> false </visible>
        </ilog>
    </attribute>
</Event>
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Output:

 0:40 >perl 1313_SoPW.pl
' volume ' is not required
' session_id ' is required

 0:40 >
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But please note the following from the documentation for XML::Simple:

STATUS OF THIS MODULE

The use of this module in new code is discouraged. Other modules are available which provide more straightforward and consistent interfaces. In particular, XML::LibXML is highly recommended.

Hope that helps,

Athanasius <°(((>< contra mundum

Iustus alius egestas vitae, eros Piratica,

First suggestion: use XML::Twig instead of XML::Simple. There are some good tutorials out there.

XML::Simple reads in the XML data into a Perl data structure, but doesn't seem to give much help in working with it. If you use Data::Dumper you can print out the data structure and go from there. You'll get good with hash references!

In my own exploration, I found the following produced a more useful data structure than the default:

my $xml = XML::Simple;
my $data = $xml->XMLin($filename, KeyAttr=>['identifier']);
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In that way, the key to the hash containing the attributes is the identifier.

Dum Spiro Spero