Looking at the documentation of XML::Checker, I can see why you're confused. ugh. It turns out that XML::Checker::Parser may be a better option. Fortunately, it's much easier:

use XML::Checker::Parser;

my $parser = XML::Checker::Parser->new();

eval { $parser->parsefile ("file.xml") };
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Thanks for your suggestion.
Do you know why I run this script:

#!C:/server/Perl/bin/perl.exe

use CGI qw(:standard);
use XML::Checker;
use XML::Checker::Parser;
use strict;
use warnings;

my %expat_options = (KeepCDATA => 1,
                      Handlers => [ Unparsed => \&my_Unparsed_handler 
+]);

my $parser = new XML::Checker::Parser (%expat_options);


eval {  local $XML::Checker::FAIL = \&my_fail;
        $parser->parsefile ("xml_teste1.xml") };

if($@){
  print "failed validation!\n";
  die "$@";
}
print "passed validation\n";
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give me an error like this:
Can't coerce array into hash at C:/server/Perl/site/lib/XML/Parser.pm line 87.
How can i resolve this error?

This is covered in the Perl XML FAQ.

Just to point out an alternative. I presume you want to use XML::Checker to validate the XML against a DTD and not just see if the XML itself is valid. If that's the case, XML::LibXML is a fine alternative. I use it in production code to validate XML against DTDs.

my $parser = XML::LibXML->new;
$parser->validation(1);
eval { $doc = $parser->parse_string($xml); };
if ($@) {
   # XML not well formed, error handling here...
}
eval { $doc->validate; };
if ($@) {
   # XML did not pass DTD validation, error handling here...
}
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Yes I use the XML::Checker to validate the XML against a DTD.
I dont need to see if th XML is valid.
But i need to catch the content of some tags of the XML file. But i dont know how can i do it.
Can you help me?
Thanks...

So your question seems to be 'how do I parse XML' rather than 'how do I validate XML'. In which case chromatic already gave you the answer. XML::Checker::Parser is a drop in replacement for XML::Parser so take a peek at the XML::Parser documentation.

Alternatively, check out Mirod's spiffy Ways to Rome.

-- vek --