validates file

[BENHAJ-ABDELLATIF,TAHIA (HP-France,ex1)]

Hello,

I want to validate the presentation of the XML document before
writing it in the file.

-To enable parameters:
 my $parser = XML::Xerces::DOMParser->new();
$validate = $XML::Xerces::DOMParser::Val_Always;
$parser->setValidationScheme($validate);
$parser->setDoNamespaces(1);
$parser->setToCreateXMLDeclTypeNode(1);
$parser->setDoSchema(1);

-modifications
- Here I want to check the validation of the content, I don't know how!!
-writing  in the XML file

What I got is that, I write the modification that I want 
but it does not validated before!!
When I parse the modified file, then it tells me that the file is invalid.

So what should I do
to validate the tree at the nmoment of the modification (before writing in
the file)??

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