Hello Monks, I am newbie to XML Parsing.I am using XML::LibXML module to parse my XML. I want to read a XML (input.xml) and update the node in (output.xml).
here is my attempt-- 
my $parser = XML::LibXML->new();
$doc = $parser->parse_file("input.xml");
my $appName = $doc->findvalue(q|@name|);

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So I have slurp whole file into $doc. Same way I have opened output.xml (complex one ) and did this way. 
 use XML::LibXML;
 my $parser = XML::LibXML->new();
 my $doc    = $parser->parse_file("output.xml");

  my $query  = "//anonotaion";

  my($node)  = $doc->findnodes($query);
  $node->setData('$appname');

  print $doc->toString;

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output.xml format is completely different from input.xml. I would like to know if there is any good way to achieve this.
fraction of xmls is --
__input.xml__ 
<appliance long_name ="my app name" revision="10.58.226.13">
<desciption_section>
<annotation>template</annotation>
<add_eula enabled="1">
<description>EULA LICENSE AGREEMENT</description>
</add_eula>
<welcome_screen enabled="1">welcome to my app </welcome_screen>
</desciption_section>
.....

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__output.xml__ 
<?xml version="1.0" encoding="utf-8"?>
<ovf:Envelope xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xm
+lns:vadk="http://www.vmware.com/schema/vadk" xmlns:ovf="http://schema
+s.dmtf.org/ovf/envelope/1" xmlns:vssd="http://schemas.dmtf.org/wbem/w
+scim/1/cim-schema/2/CIM_VirtualSystemSettingData" xmlns:rasd="http://
+schemas.dmtf.org/wbem/wscim/1/cim-schema/2/CIM_ResourceAllocationSett
+ingData" xmlns:vmw="http://www.vmware.com/schema/ovf" xmlns:vsm="http
+://www.vmware.com/schema/vServiceManager" xsi:schemaLocation="http://
+schemas.dmtf.org/ovf/envelope/1 /opt/vmware/etc/build/schemas/vadk.xs
+d" ovf:version="0.7.0" vadk:version="2.6.0.0">
    <References>
        <File ovf:href="system.vmdk" ovf:id="system.vmdk_id"/>
    </References>
<!--
        The Annotation element of the AnnotationSection_Type is the te
+xt
        that will be presented as the Description of the VM.
    -->
    <Section xsi:type="ovf:AnnotationSection_Type">
        <Info/>
        <Annotation>new app</Annotation>
    </Section>
    <Section xsi:type="ovf:ProductSection_Type" ovf:required="false">
        <Info>branding information</Info>
        <Product>OvMabk</Product>
        <Vendor></Vendor>

....

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In reply to Reading and updating XML by prashantktyagi

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