NAME

       XML::Filter::SAXT - Replicates SAX events to several SAX event handlers

SYNOPSIS

        $saxt = new XML::Filter::SAXT ( { Handler => $out1 },
                                        { DocumentHandler => $out2 },
                                        { DTDHandler => $out3,
                                          Handler => $out4
                                        }
                                      );

        $perlsax = new XML::Parser::PerlSAX ( Handler => $saxt );
        $perlsax->parse ( [OPTIONS] );

DESCRIPTION

       SAXT is like the Unix 'tee' command in that it multiplexes the input stream to several
       output streams. In this case, the input stream is a PerlSAX event producer (like
       XML::Parser::PerlSAX) and the output streams are PerlSAX handlers or filters.

       The SAXT constructor takes a list of hash references. Each hash specifies an output
       handler. The hash keys can be: DocumentHandler, DTDHandler, EntityResolver or Handler,
       where Handler is a combination of the previous three and acts as the default handler.
       E.g. if DocumentHandler is not specified, it will try to use Handler.

   EXAMPLE
       In this example we use XML::Parser::PerlSAX to parse an XML file and to invoke the PerlSAX
       callbacks of our SAXT object. The SAXT object then forwards the callbacks to XML::Checker,
       which will 'die' if it encounters an error, and to XML::Handler::BuildDOM, which will
       store the XML in an XML::DOM::Document.

        use XML::Parser::PerlSAX;
        use XML::Filter::SAXT;
        use XML::Handler::BuildDOM;
        use XML::Checker;

        my $checker = new XML::Checker;
        my $builder = new XML::Handler::BuildDOM (KeepCDATA => 1);
        my $tee = new XML::Filter::SAXT ( { Handler => $checker },
                                          { Handler => $builder } );

        my $parser = new XML::Parser::PerlSAX (Handler => $tee);
        eval
        {
           # This is how you set the error handler for XML::Checker
           local $XML::Checker::FAIL = \&my_fail;

           my $dom_document = $parser->parsefile ("file.xml");
           ... your code here ...
        };
        if ($@)
        {
           # Either XML::Parser::PerlSAX threw an exception (bad XML)
           # or XML::Checker found an error and my_fail died.
           ... your error handling code here ...
        }

        # XML::Checker error handler
        sub my_fail
        {
          my $code = shift;
          die XML::Checker::error_string ($code, @_)
               if $code < 200;   # warnings and info messages are >= 200
        }

CAVEATS

       This is still alpha software.  Package names and interfaces are subject to change.

AUTHOR

       Enno Dersken is the original author.

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