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Manual Reference Pages  -  XML::DOM::VALPARSER (3)

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NAME

XML::DOM::ValParser - an XML::DOM::Parser that validates at parse time

CONTENTS

SYNOPSIS



 use XML::DOM::ValParser;

 my %expat_options = (KeepCDATA => 1,
                      Handlers => [ Unparsed => \&my_Unparsed_handler ]);
 my $parser = new XML::DOM::ValParser (%expat_options);

 eval {
     local $XML::Checker::FAIL = \&my_fail;
     my $doc = $parser->parsefile ("fail.xml");
     ... XML::DOM::Document was created sucessfully ...
 };
 if ($@) {
     # Either XML::Parser (expat) threw an exception or my_fail() died.
     ... your error handling code here ...
     # Note that the XML::DOM::Document is automatically disposed off and
     # will be garbage collected
 }

 # Throws an exception (with die) when an error is encountered, this
 # will stop the parsing process.
 # Dont die if a warning or info message is encountered, just print a message.
 sub my_fail {
     my $code = shift;
     die XML::Checker::error_string ($code, @_) if $code < 200;
     XML::Checker::print_error ($code, @_);
 }



DESCRIPTION

Use XML::DOM::ValParser wherever you would use XML::DOM::Parser and your XML will be checked using XML::Checker at parse time.

See XML::DOM for details on XML::DOM::Parser options. See XML::Checker for details on setting the fail handler (my_fail.)

The following handlers are currently supported, just like XML::DOM::Parser: Init, Final, Char, Start, End, Default, Doctype, CdataStart, CdataEnd, XMLDecl, Entity, Notation, Proc, Default, Comment, Attlist, Element, Unparsed.

XML::DOM::ValParser

XML::DOM::ValParser extends from XML::Checker::Parser. It creates an XML::Checker object and routes all event handlers through the checker, before processing the events to create the XML::DOM::Document.

Just like XML::Checker::Parser, the checker object can be retrieved with the getChecker() method and can be reused later on (provided that the DOCTYPE section of the XML::DOM::Document did not change in the mean time.)

You can control which errors are fatal (and therefore should stop creation of the XML::DOM::Document) by filtering the appropriate error codes in the global $XML::Checker::FAIL handler (see ERROR_HANDLING in XML::Checker) and calling die or croak appropriately.

Just like XML::Checker::Parser, XML::DOM::ValParser supports the SkipExternalDTD and SkipInsignifWS options. See XML::Checker::Parser for details.

AUTHOR

Send bug reports, hints, tips, suggestions to Enno Derksen at <enno@att.com>.

SEE ALSO

XML::DOM, XML::Checker (SEE_ALSO in XML::Checker)
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perl v5.20.3 XML::DOM::VALPARSER (3) 2000-01-31

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