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name : Meta_1_0.pod =for :stopwords DOAP RDF =head1 NAME CPAN::Meta::History::Meta_1_0 - Version 1.0 metadata specification for META.yml =head1 PREFACE This is a historical copy of the version 1.0 specification for F<META.yml> files, copyright by Ken Williams and licensed under the same terms as Perl itself. Modifications from the original: =over =item * Conversion from the original HTML to POD format =item * Include list of valid licenses from L<Module::Build> 0.17 rather than linking to the module, with minor updates to text and links to reflect versions at the time of publication. =item * Fixed some dead links to point to active resources. =back =head1 DESCRIPTION This document describes version 1.0 of the F<META.yml> specification. The META.yml file describes important properties of contributed Perl distributions such as the ones found on L<CPAN|http://www.cpan.org>. It is typically created by tools like L<Module::Build> and L<ExtUtils::MakeMaker>. The fields in the F<META.yml> file are meant to be helpful to people maintaining module collections (like CPAN), for people writing installation tools (like L<CPAN> or L<CPANPLUS>), or just people who want to know some stuff about a distribution before downloading it and starting to install it. =head1 Format F<META.yml> files are written in the L<YAML|http://www.yaml.org/> format. The reasons we chose YAML instead of, say, XML or Data::Dumper are discussed in L<this thread|http://www.nntp.perl.org/group/perl.makemaker/2002/04/msg406.html> on the MakeMaker mailing list. The first line of a F<META.yml> file should be a valid L<YAML document header|http://yaml.org/spec/history/2002-10-31.html#syntax-document> like C<"--- #YAML:1.0"> =head1 Fields The rest of the META.yml file is one big YAML L<mapping|http://yaml.org/spec/history/2002-10-31.html#syntax-mapping>, whose keys are described here. =over 4 =item name Example: C<Module-Build> The name of the distribution. Often created by taking the "main module" in the distribution and changing "::" to "-". Sometimes it's completely different, however, as in the case of the L<libwww-perl|http://search.cpan.org/author/GAAS/libwww-perl/> distribution. =item version Example: C<0.16> The version of the distribution to which the META.yml file refers. =item license Example: C<perl> The license under which this distribution may be used and redistributed. Must be one of the following licenses: =over 4 =item perl The distribution may be copied and redistributed under the same terms as perl itself (this is by far the most common licensing option for modules on CPAN). This is a dual license, in which the user may choose between either the GPL version 1 or the Artistic version 1 license. =item gpl The distribution is distributed under the terms of the GNU General Public License version 2 (L<http://opensource.org/licenses/GPL-2.0>). =item lgpl The distribution is distributed under the terms of the GNU Lesser General Public License version 2 (L<http://opensource.org/licenses/LGPL-2.1>). =item artistic The distribution is licensed under the Artistic License version 1, as specified by the Artistic file in the standard perl distribution (L<http://opensource.org/licenses/Artistic-Perl-1.0>). =item bsd The distribution is licensed under the BSD 3-Clause License (L<http://opensource.org/licenses/BSD-3-Clause>). =item open_source The distribution is licensed under some other Open Source Initiative-approved license listed at L<http://www.opensource.org/licenses/>. =item unrestricted The distribution is licensed under a license that is B<not> approved by L<www.opensource.org|http://www.opensource.org/> but that allows distribution without restrictions. =item restrictive The distribution may not be redistributed without special permission from the author and/or copyright holder. =back =item distribution_type Example: C<module> What kind of stuff is contained in this distribution. Most things on CPAN are C<module>s (which can also mean a collection of modules), but some things are C<script>s. =item requires Example: Data::Dumper: 0 File::Find: 1.03 A YAML L<mapping|http://yaml.org/spec/history/2002-10-31.html#syntax-mapping> indicating the Perl modules this distribution requires for proper operation. The keys are the module names, and the values are version specifications as described in the L<documentation for Module::Build's "requires" parameter|Module::Build::API/requires>. I<Note: the exact nature of the fancy specifications like C<< ">= 1.2, != 1.5, < 2.0" >> is subject to change. Advance notice will be given here. The simple specifications like C<"1.2"> will not change in format.> =item recommends Example: Data::Dumper: 0 File::Find: 1.03 A YAML L<mapping|http://yaml.org/spec/history/2002-10-31.html#syntax-mapping> indicating the Perl modules this distribution recommends for enhanced operation. =item build_requires Example: Data::Dumper: 0 File::Find: 1.03 A YAML L<mapping|http://yaml.org/spec/history/2002-10-31.html#syntax-mapping> indicating the Perl modules required for building and/or testing of this distribution. These dependencies are not required after the module is installed. =item conflicts Example: Data::Dumper: 0 File::Find: 1.03 A YAML L<mapping|http://yaml.org/spec/history/2002-10-31.html#syntax-mapping> indicating the Perl modules that cannot be installed while this distribution is installed. This is a pretty uncommon situation. =item dynamic_config Example: C<0> A boolean flag indicating whether a F<Build.PL> or F<Makefile.PL> (or similar) must be executed, or whether this module can be built, tested and installed solely from consulting its metadata file. The main reason to set this to a true value if that your module performs some dynamic configuration (asking questions, sensing the environment, etc.) as part of its build/install process. Currently L<Module::Build> doesn't actually do anything with this flag - it's probably going to be up to higher-level tools like L<CPAN.pm|CPAN> to do something useful with it. It can potentially bring lots of security, packaging, and convenience improvements. =item generated_by Example: C<Module::Build version 0.16> Indicates the tool that was used to create this F<META.yml> file. It's good form to include both the name of the tool and its version, but this field is essentially opaque, at least for the moment. =back =head1 Related Projects =over 4 =item DOAP An RDF vocabulary to describe software projects. L<http://usefulinc.com/doap>. =back =head1 History =over 4 =item * B<March 14, 2003> (Pi day) - created version 1.0 of this document. =item * B<May 8, 2003> - added the "dynamic_config" field, which was missing from the initial version. =back