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SAX::ParserFactory(3) User Contributed Perl DocumentationSAX::ParserFactory(3)

       XML::SAX::ParserFactory - Obtain a SAX parser

         use XML::SAX::ParserFactory;
         use XML::SAX::XYZHandler;
         my $handler = XML::SAX::XYZHandler->new();
         my $p = XML::SAX::ParserFactory->parser(Handler => $handler);
         # or $p->parse_string("<foo/>") or $p->parse_file($fh);

       XML::SAX::ParserFactory is a factory class for providing an application
       with a Perl SAX2 XML parser. It is akin to DBI - a front end for other
       parser classes. Each new SAX2 parser installed will register itself
       with XML::SAX, and then it will become available to all applications
       that use XML::SAX::ParserFactory to obtain a SAX parser.

       Unlike DBI however, XML/SAX parsers almost all work alike (especially
       if they subclass XML::SAX::Base, as they should), so rather than
       specifying the parser you want in the call to "parser()", XML::SAX has
       several ways to automatically choose which parser to use:

       o   $XML::SAX::ParserPackage

           If this package variable is set, then this package is "require()"d
           and an instance of this package is returned by calling the "new()"
           class method in that package. If it cannot be loaded or there is an
           error, an exception will be thrown. The variable can also contain a
           version number:

             $XML::SAX::ParserPackage = "XML::SAX::Expat (0.72)";

           And the number will be treated as a minimum version number.

       o   Required features

           It is possible to require features from the parsers. For example,
           you may wish for a parser that supports validation via a DTD. To do
           that, use the following code:

             use XML::SAX::ParserFactory;
             my $factory = XML::SAX::ParserFactory->new();
             my $parser = $factory->parser(...);

           Alternatively, specify the required features in the call to the
           ParserFactory constructor:

             my $factory = XML::SAX::ParserFactory->new(
                     RequiredFeatures => {
                          'http://xml.org/sax/features/validation' => 1,

           If the features you have asked for are unavailable (for example the
           user might not have a validating parser installed), then an
           exception will be thrown.

           The list of known parsers is searched in reverse order, so it will
           always return the last installed parser that supports all of your
           requested features (Note: this is subject to change if someone
           comes up with a better way of making this work).

       o   SAX.ini

           ParserFactory will search @INC for a file called SAX.ini, which is
           in a simple format:

             # a comment looks like this,
             ; or like this, and are stripped anywhere in the file
             key = value # SAX.in contains key/value pairs.

           All whitespace is non-significant.

           This file can contain either a line:

             ParserPackage = MyParserModule (1.02)

           Where MyParserModule is the module to load and use for the parser,
           and the number in brackets is a minimum version to load.

           Or you can list required features:

             http://xml.org/sax/features/validation = 1

           And each feature with a true value will be required.

       o   Fallback

           If none of the above works, the last parser installed on the user's
           system will be used. The XML::SAX package ships with a pure perl
           XML parser, XML::SAX::PurePerl, so that there will always be a
           fallback parser.

       Matt Sergeant, matt@sergeant.org

       This is free software, you may use it and distribute it under the same
       terms as Perl itself.

perl v5.12.1                      2008-08-04             SAX::ParserFactory(3)

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