I am trying to parse an XML file but I am getting an error when I try to read an empty tag. I have looked at the docs and I have added if statements but they dont work. Can someone help? 
#!/usr/bin/perl

#use warnings;
#use strict;
use XML::DOM;
use LWP::UserAgent;
use LWP::Simple;

open( CONTACTS, "+<contacts2.xml" )
  or die( "Error opening contact.xml" );

my $parser = new XML::DOM::Parser;
my $document = $parser->parse( \*CONTACTS );

printlist( $document );

seek( CONTACTS, 0, 0 );
truncate( CONTACTS, 0 );
$document->print( \*CONTACTS );


sub printlist
{
   my $document = shift;
   my $root =
         $document->getElementsByTagName( "ResultSet" )->item( 0 );
   my $contactList = $root->getChildNodes();

   for my $i ( 1 .. $contactList->getLength - 1 ) {

      my $contact = $contactList->item( $i );
      next unless ( $contact->getNodeName eq 'Result' );

      my $Title = $contact->getElementsByTagName( "Title" );
      my $title =  $Title->item( 0 )->getChildAtIndex( 0 )->getData();

      my $Address = $contact->getElementsByTagName( "Address" );
      my $address = $Address->item( 0 )->getChildAtIndex( 0 )->getData
+();

      my $City = $contact->getElementsByTagName( "City" );
      my $city = $City->item( 0 )->getChildAtIndex( 0 )->getData();

      my $State = $contact->getElementsByTagName( "State" );
      my $state = $State->item( 0 )->getChildAtIndex( 0 )->getData();

      my $Phone = $contact->getElementsByTagName( "Phone" );
      my $phone = $Phone->item( 0 )->getChildAtIndex( 0 )->getData();

      my $Lat = $contact->getElementsByTagName( "Latitude" );
      my $lat = $Lat->item( 0 )->getChildAtIndex( 0 )->getData();

      my $Long = $contact->getElementsByTagName( "Longitude" );
      my $long = $Long->item( 0 )->getChildAtIndex( 0 )->getData();

      $BusUrl = $contact->getElementsByTagName( "BusinessUrl" );
      $bus_url = $BusUrl->item( 0 )->getChildAtIndex( 0 )->getData();


      # change phone number format
      $phone =~ s/\(//;
      $phone =~ s/\)//;
      $phone =~ s/-//;
      $phone =~ s/\s+//;

      print( "$title $address $city $state $phone $lat $long $bus_url\
+n" );
   }
}

[download]
This is the input file: 

<ResultSet>
   <Result>
      <Title>My Real Estate Agent</Title>
      <Address>74738 Jones Ave</Address>
      <City>Leesburg</City>
      <State>VA</State>
      <Phone>(703) 723-1113</Phone>
      <Latitude>84848894</Latitude>
      <Longitude>23232</Longitude>
      <BusinessUrl>http://www.mcmmcmmc.net</BusinessUrl>
   </Result>

   <Result>
      <Title>Johns Bakery</Title>
      <Address>8484399 heewis Dr</Address>
      <City>Sterling</City>
      <State>VA</State>
      <Phone>(703) 723-1114</Phone>
      <Latitude>8383883</Latitude>
      <Longitude>213123</Longitude>
      <BusinessUrl></BusinessUrl>
   </Result>

   <Result>
      <Title>Kevins flooring</Title>
      <Address>84848484 kevin drive</Address>
      <City>Fairfax</City>
      <State>VA</State>
      <Phone>(703) 723-1115</Phone>
      <Latitude>2321321</Latitude>
      <Longitude>123</Longitude>
      <BusinessUrl>http://www.nothing.com</BusinessUrl>
   </Result>

</ResultSet>

[download]
I get an error when it tries to getData for Johns Bakery because the <BusinessUrl></BusinessUrl> is empty. Error message: Can't call method "getData" on an undefined value at parse_xml.pl line 74. These do not work: 
if( $#BusUrl < 0 )
if( length $contact->getElementsByTagName( "BusinessUrl" ))
if ($BusUrl)
if (defined ( $BusUrl  ))
if (defined ( $contact->getElementsByTagName( "BusinessUrl" )))
if ($BusUrl)
if ($BusUrl->item( 0 )->getChildAtIndex( 0 )->getLength)

[download]

In reply to use XML::DOM - what to do with empty tags? by kevyt

Title:
Use:  <p> text here (a paragraph) </p>
and:  <code> code here </code>
to format your post, it's "PerlMonks-approved HTML":


  • Posts are HTML formatted. Put <p> </p> tags around your paragraphs. Put <code> </code> tags around your code and data!
  • Titles consisting of a single word are discouraged, and in most cases are disallowed outright.
  • Read Where should I post X? if you're not absolutely sure you're posting in the right place.
  • Please read these before you post! —
  • Posts may use any of the Perl Monks Approved HTML tags:
    a, abbr, b, big, blockquote, br, caption, center, col, colgroup, dd, del, details, div, dl, dt, em, font, h1, h2, h3, h4, h5, h6, hr, i, ins, li, ol, p, pre, readmore, small, span, spoiler, strike, strong, sub, summary, sup, table, tbody, td, tfoot, th, thead, tr, tt, u, ul, wbr
  • You may need to use entities for some characters, as follows. (Exception: Within code tags, you can put the characters literally.)
            For:     Use:
    & &amp;
    < &lt;
    > &gt;
    [ &#91;
    ] &#93;
  • Link using PerlMonks shortcuts! What shortcuts can I use for linking?
  • See Writeup Formatting Tips and other pages linked from there for more info.