Sun751 has asked for the wisdom of the Perl Monks concerning the following question:

Structure of my XML file is like this 
<CONFIGURATION 
  <APPLICATION_SERVER>
       <RESOURCE_LIST>
      <PLATFORM_INDEPENDENT>
            <RESOURCE Id="res.wacgen" Source="INTERNAL">$(res.appl)</R
+ESOURCE>
    <RESOURCE Id="res.wacgenlib" Source="INTERNAL">$(res.appl)$(res.sl
+ash)all.4gm</RESOURCE>
    <RESOURCE Id="res.waclibext" Source="INTERNAL">4gs</RESOURCE>
    <RESOURCE Id="res.fcode" Source="INTERNAL">rt.2.10.01-1138</RESOUR
+CE>
    <RESOURCE Id="res.frunext" Source="INTERNAL">ifx</RESOURCE>
    <RESOURCE Id="res.db_type" Source="INTERNAL">msv</RESOURCE>

          </PLATFORM_INDEPENDENT>
        </RESOURCE_LIST>
      </APPLICATION_SERVER>
</CONFIGURATION

[download]
And i am trying to check each attribute like this, 
my $source = '/sand/devel/sthapa/tmp/as.xcf-dist';
my $Tag_Resource ='/CONFIGURATION/APPLICATION_SERVER/RESOURCE_LIST/';
my $Tag_Resource_PI=$Tag_Resource.'PLATFORM_INDEPENDENT/RESOURCE';
    my $Tag_wnt=$Tag_Resource.'WNT/RESOURCE';
    my $os_res_group;

    my $parser=new XML::XPath->new(filename => $source);
    $parser or die "Unable to parse sourse file: $source\n";

    my $Set_Resource = $parser->find($Tag_Resource_PI);

    foreach my $resource ($Set_Resource->get_nodelist)
    {
        my $attribute=$resource->getAttribute('Id');
        my $child_node = $resource->getChildNodes();
        if (exists $$HRR_resource{$attribute})
        {
        print "Attribute exists: $attribute";
        }
        else
        {
         #Add attribute to XML
        }

[download]
So I am trying to add all the attribute whichever does not exists in hash to XML using XML::XPath, but I am not being able to do that, any one have any suggestion???

Replies are listed 'Best First'.
Re: Add New Attribute to XML
by Your Mother (Archbishop) on Jun 22, 2009 at 16:59 UTC

    The license for this code requires that you recycle and are kind to strangers. 

    use strict;
use warnings;
use XML::LibXML;

my $doc = XML::LibXML->new->parse_fh(\*DATA);

# Your real file:
# my $doc = XML::LibXML->new->parse_file('/sand/devel/sthapa/tmp/as.xc
+f-dist');

for my $rsc ( $doc->getDocumentElement->findnodes("//RESOURCE") )
{
    unless ( $rsc->hasAttribute("Id") )
    {
        $rsc->setAttribute("Id", "AUTO-ID");
    }
}

print $doc->serialize(1);

# Or to a file-
# $doc->toFile($filename);

__DATA__
<?xml version="1.0"?>
<CONFIGURATION>
  <APPLICATION_SERVER>
    <RESOURCE_LIST>
      <PLATFORM_INDEPENDENT>
       <RESOURCE Id="res.wacgen" Source="INTERNAL">$(res.appl)</RESOUR
+CE>
       <RESOURCE Id="res.wacgenlib" Source="INTERNAL">$(res.appl)$(res
+.slash)all.4gm</RESOURCE>
       <RESOURCE Id="res.waclibext" Source="INTERNAL">4gs</RESOURCE>
       <RESOURCE Id="res.fcode" Source="INTERNAL">rt.2.10.01-1138</RES
+OURCE>
       <RESOURCE Id="res.frunext" Source="INTERNAL">ifx</RESOURCE>
       <RESOURCE Id="res.db_type" Source="INTERNAL">msv</RESOURCE>
       <RESOURCE Source="INTERNAL">OH HAI, I CAN HAZ ID?</RESOURCE>
      </PLATFORM_INDEPENDENT>
    </RESOURCE_LIST>
  </APPLICATION_SERVER>
</CONFIGURATION>

    [download]
[reply]
[d/l]
Re: Add New Attribute to XML
by Anonymous Monk on Jun 22, 2009 at 07:08 UTC
    I've a question, why pick XML::XPath, it hasn't been updated in years?

    I'm a fan of XML::Twig, so I would adapt this example 

    #!/usr/bin/perl --
use strict;
use warnings;
use XML::Twig;
my $source = '/sand/devel/sthapa/tmp/as.xcf-dist';
my $Tag_Resource ='/CONFIGURATION/APPLICATION_SERVER/RESOURCE_LIST/';
my $Tag_Resource_PI = $Tag_Resource.'PLATFORM_INDEPENDENT/RESOURCE';
my $Tag_wnt = $Tag_Resource.'WNT/RESOURCE';

my $t = XML::Twig->new(
    twig_roots => {
# /CONFIGURATION/APPLICATION_SERVER/RESOURCE_LIST/WNT/RESOURCE
        $Tag_wnt => sub {
            my ( $t, $price ) = @_;
            {
                my $id = $price->att('Id');
                if (exists $$HRR_resource{$id}){
                    print "Attribute exists: $id";
                }
            }
            $price->print(\*STDOUT);
        },
    },
    twig_print_outside_roots => \*STDOUT,
);
$t->parsefile($source);
$t->flush;    #don't forget
undef $t;

    [download]
    or try adapting XML::LibXML example
[reply]
[d/l]
      I am wondering if there is any other way to do this either by use XML::XPath or XML::XPath::Xparser???
[reply]

        Looking at the Source of XML::XPath::Node, there is the insertAfter method for nodes, which you can use to append other nodes after an existing node. But it doesn't seem like XML::XPath is geared towards XML manipulation. You're likely better off using one of the other XML modules. Potentially, XML::LibXML is geared towards both, XPath and DOM manipulation.

[reply]
[d/l]
        Probably, but I can't help you with that, I don't use either :)
[reply]

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