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:


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.

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 => {
               '' => 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).

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 # 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: = 1

And each feature with a true value will be required.


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,


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


Personal Opportunity - Free software gives you access to billions of dollars of software at no cost. Use this software for your business, personal use or to develop a profitable skill. Access to source code provides access to a level of capabilities/information that companies protect though copyrights. Open source is a core component of the Internet and it is available to you. Leverage the billions of dollars in resources and capabilities to build a career, establish a business or change the world. The potential is endless for those who understand the opportunity.

Business Opportunity - Goldman Sachs, IBM and countless large corporations are leveraging open source to reduce costs, develop products and increase their bottom lines. Learn what these companies know about open source and how open source can give you the advantage.

Free Software

Free Software provides computer programs and capabilities at no cost but more importantly, it provides the freedom to run, edit, contribute to, and share the software. The importance of free software is a matter of access, not price. Software at no cost is a benefit but ownership rights to the software and source code is far more significant.

Free Office Software - The Libre Office suite provides top desktop productivity tools for free. This includes, a word processor, spreadsheet, presentation engine, drawing and flowcharting, database and math applications. Libre Office is available for Linux or Windows.

Free Books

The Free Books Library is a collection of thousands of the most popular public domain books in an online readable format. The collection includes great classical literature and more recent works where the U.S. copyright has expired. These books are yours to read and use without restrictions.

Source Code - Want to change a program or know how it works? Open Source provides the source code for its programs so that anyone can use, modify or learn how to write those programs themselves. Visit the GNU source code repositories to download the source.


Study at Harvard, Stanford or MIT - Open edX provides free online courses from Harvard, MIT, Columbia, UC Berkeley and other top Universities. Hundreds of courses for almost all major subjects and course levels. Open edx also offers some paid courses and selected certifications.

Linux Manual Pages - A man or manual page is a form of software documentation found on Linux/Unix operating systems. Topics covered include computer programs (including library and system calls), formal standards and conventions, and even abstract concepts.