sax(3)

NAME

XML::SAX - Simple API for XML

SYNOPSIS

use XML::SAX;
# get a list of known parsers
my $parsers = XML::SAX->parsers();
# add/update a parser
XML::SAX->add_parser(q(XML::SAX::PurePerl));
# remove parser
XML::SAX->remove_parser(q(XML::SAX::Foodelberry));
# save parsers
XML::SAX->save_parsers();

DESCRIPTION

XML::SAX is a SAX parser access API for Perl. It includes
classes and APIs required for implementing SAX drivers,
along with a factory class for returning any SAX parser
installed on the user's system.

USING A SAX2 PARSER

The factory class is XML::SAX::ParserFactory. Please see the documentation of that module for how to instantiate a SAX parser: XML::SAX::ParserFactory. However if you don't want to load up another manual page, here's a short synop sis:: use XML::SAX::ParserFactory;
use XML::SAX::XYZHandler;
my $handler = XML::SAX::XYZHandler->new();
my $p = XML::SAX::ParserFactory->parser(Handler => $han; dler);
$p->parse_uri("foo.xml");
# or $p->parse_string("<foo/>") or $p->parse_file($fh);
This will automatically load a SAX2 parser (defaulting to XML::SAX::PurePerl if no others are found) and return it to you.
In order to learn how to use SAX to parse XML, you will need to read XML::SAX::Intro and for reference, XML::SAX::Specification.

WRITING A SAX2 PARSER

The first thing to remember in writing a SAX2 parser is to
subclass XML::SAX::Base. This will make your life
infinitely easier, by providing a number of methods
automagically for you. See XML::SAX::Base for more
details.

When writing a SAX2 parser that is compatible with
XML::SAX, you need to inform XML::SAX of the presence of
that driver when you install it. In order to do that,
XML::SAX contains methods for saving the fact that the
parser exists on your system to a "INI" file, which is
then loaded to determine which parsers are installed.

The best way to do this is to follow these rules:

� Add XML::SAX as a prerequisite in Makefile.PL:: WriteMakefile(
...
PREREQ_PM => { 'XML::SAX' => 0 },
...; );
Alternatively you may wish to check for it in other ways that will cause more than just a warning.
� Add the following code snippet to your Makefile.PL:: sub MY::install {
package MY;
my $script = shift->SUPER::install(@_);
if (ExtUtils::MakeMaker::prompt(
"Do you want to modify ParserDetails.ini?", 'Y')
=~ /^y/i) {
$script =~ s/install :: (.*)$/install :: $1 in

stall_sax_driver/m;
$script .= <<"INSTALL";

install_sax_driver :
@RL) -MXML::SAX -e "XML::SAX->add_pars

er(q(ME)))->save_parsers()"

INSTALL

}
return $script;

}; Note that you should check the output of this ME) will use the name of your distribution, which
may not be exactly what you want. For example
XML::LibXML has a driver called XML::LibXML::SAX::Gen
erator, which is used in place of ME) in the
above.
� Add an XML::SAX test:: A test file should be added to your t/ directory con
taining something like the following:

use Test;
BEGIN { plan tests => 3 }
use XML::SAX;
use XML::SAX::PurePerl::DebugHandler;
XML::SAX->add_parser(q(XML::SAX::MyDriver));
local $XML::SAX::ParserPackage = 'XML::SAX::MyDriv

er';
eval {
my $handler = XML::SAX::PurePerl::DebugHan

dler->new();
ok($handler);
my $parser = XML::SAX::ParserFactory->parser(Han

dler => $handler);
ok($parser);
ok($parser->isa('XML::SAX::MyDriver');
$parser->parse_string("<tag/>");
ok($handler->{seen}{start_element});

};

EXPORTS

By default, XML::SAX exports nothing into the caller's namespace. However you can request the symbols "Names paces" and "Validation" which are the URIs for those fea tures, allowing an easier way to request those features via ParserFactory:: use XML::SAX qw(Namespaces Validation);
my $factory = XML::SAX::ParserFactory->new();
$factory->require_feature(Namespaces);
$factory->require_feature(Validation);
my $parser = $factory->parser();

AUTHOR

Matt Sergeant, matt@sergeant.org

Kip Hampton, khampton@totalcinema.com

Robin Berjon, robin@knowscape.com

LICENSE

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

docs.sk

comprehensive documentation repository

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