Provided by: libxml-filter-saxt-perl_0.01-7_all bug


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


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

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


       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.

       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);
           # 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


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


       Enno Dersken is the original author.

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