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XML::DOM::ValParser.3pm

NAME

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

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.
  # Don't 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

Enno Derksen is the original author.

Send bug reports, hints, tips, suggestions to T.J. Mather at <tjmather@tjmather.com>.

SEE ALSO

XML::DOM, XML::Checker (``SEE_ALSO'' in XML::Checker)