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.\"
.IX Title "CPAN::Meta::History 3"
.TH CPAN::Meta::History 3 "2019-10-24" "perl v5.30.2" "Perl Programmers Reference Guide"
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.SH "NAME"
CPAN::Meta::History \- history of CPAN Meta Spec changes
.SH "VERSION"
.IX Header "VERSION"
version 2.150010
.SH "DESCRIPTION"
.IX Header "DESCRIPTION"
The \s-1CPAN\s0 Meta Spec has gone through several iterations.  It was
originally written in \s-1HTML\s0 and later revised into \s-1POD\s0 (though published
in \s-1HTML\s0 generated from the \s-1POD\s0).  Fields were added, removed or changed,
sometimes by design and sometimes to reflect real-world usage after the
fact.
.PP
This document reconstructs the history of the \s-1CPAN\s0 Meta Spec based on
change logs, repository commit messages and the published \s-1HTML\s0 files.
In some cases, particularly prior to version 1.2, the exact version
when certain fields were introduced or changed is inconsistent between
sources.  When in doubt, the published \s-1HTML\s0 files for versions 1.0 to
1.4 as they existed when version 2 was developed are used as the
definitive source.
.PP
Starting with version 2, the specification document is part of the
CPAN-Meta distribution and will be published on \s-1CPAN\s0 as
CPAN::Meta::Spec.
.PP
Going forward, specification version numbers will be integers and
decimal portions will correspond to a release date for the CPAN::Meta
library.
.SH "HISTORY"
.IX Header "HISTORY"
.SS "Version 2"
.IX Subsection "Version 2"
April 2010
.IP "\(bu" 4
Revised spec examples as perl data structures rather than \s-1YAML\s0
.IP "\(bu" 4
Switched to \s-1JSON\s0 serialization from \s-1YAML\s0
.IP "\(bu" 4
Specified allowed version number formats
.IP "\(bu" 4
Replaced 'requires', 'build_requires', 'configure_requires',
\&'recommends' and 'conflicts' with new 'prereqs' data structure divided
by \fIphase\fR (configure, build, test, runtime, etc.) and \fIrelationship\fR
(requires, recommends, suggests, conflicts)
.IP "\(bu" 4
Added support for 'develop' phase for requirements for maintaining
a list of authoring tools
.IP "\(bu" 4
Changed 'license' to a list and revised the set of valid licenses
.IP "\(bu" 4
Made 'dynamic_config' mandatory to reduce confusion
.IP "\(bu" 4
Changed 'resources' subkey 'repository' to a hash that clarifies
repository type, url for browsing and url for checkout
.IP "\(bu" 4
Changed 'resources' subkey 'bugtracker' to a hash for either web
or mailto resource
.IP "\(bu" 4
Changed specification of 'optional_features':
.RS 4
.IP "\(bu" 4
Added formal specification and usage guide instead of just example
.IP "\(bu" 4
Changed to use new prereqs data structure instead of individual keys
.RE
.RS 4
.RE
.IP "\(bu" 4
Clarified intended use of 'author' as generalized contact list
.IP "\(bu" 4
Added 'release_status' field to indicate stable, testing or unstable
status to provide hints to indexers
.IP "\(bu" 4
Added 'description' field for a longer description of the distribution
.IP "\(bu" 4
Formalized use of \*(L"x_\*(R" or \*(L"X_\*(R" for all custom keys not listed in the
official spec
.SS "Version 1.4"
.IX Subsection "Version 1.4"
June 2008
.IP "\(bu" 4
Noted explicit support for 'perl' in prerequisites
.IP "\(bu" 4
Added 'configure_requires' prerequisite type
.IP "\(bu" 4
Changed 'optional_features'
.RS 4
.IP "\(bu" 4
Example corrected to show map of maps instead of list of maps
(though descriptive text said 'map' even in v1.3)
.IP "\(bu" 4
Removed 'requires_packages', 'requires_os' and 'excluded_os'
as valid subkeys
.RE
.RS 4
.RE
.SS "Version 1.3"
.IX Subsection "Version 1.3"
November 2006
.IP "\(bu" 4
Added 'no_index' subkey 'directory' and removed 'dir' to match actual
usage in the wild
.IP "\(bu" 4
Added a 'repository' subkey to 'resources'
.SS "Version 1.2"
.IX Subsection "Version 1.2"
August 2005
.IP "\(bu" 4
Re-wrote and restructured spec in \s-1POD\s0 syntax
.IP "\(bu" 4
Changed 'name' to be mandatory
.IP "\(bu" 4
Changed 'generated_by' to be mandatory
.IP "\(bu" 4
Changed 'license' to be mandatory
.IP "\(bu" 4
Added version range specifications for prerequisites
.IP "\(bu" 4
Added required 'abstract' field
.IP "\(bu" 4
Added required 'author' field
.IP "\(bu" 4
Added required 'meta\-spec' field to define 'version' (and 'url') of the
\&\s-1CPAN\s0 Meta Spec used for metadata
.IP "\(bu" 4
Added 'provides' field
.IP "\(bu" 4
Added 'no_index' field and deprecated 'private' field.  'no_index'
subkeys include 'file', 'dir', 'package' and 'namespace'
.IP "\(bu" 4
Added 'keywords' field
.IP "\(bu" 4
Added 'resources' field with subkeys 'homepage', 'license', and
\&'bugtracker'
.IP "\(bu" 4
Added 'optional_features' field as an alternate under 'recommends'.
Includes 'description', 'requires', 'build_requires', 'conflicts',
\&'requires_packages', 'requires_os' and 'excluded_os' as valid subkeys
.IP "\(bu" 4
Removed 'license_uri' field
.SS "Version 1.1"
.IX Subsection "Version 1.1"
May 2003
.IP "\(bu" 4
Changed 'version' to be mandatory
.IP "\(bu" 4
Added 'private' field
.IP "\(bu" 4
Added 'license_uri' field
.SS "Version 1.0"
.IX Subsection "Version 1.0"
March 2003
.IP "\(bu" 4
Original release (in \s-1HTML\s0 format only)
.IP "\(bu" 4
Included 'name', 'version', 'license', 'distribution_type', 'requires',
\&'recommends', 'build_requires', 'conflicts', 'dynamic_config',
\&'generated_by'
.SH "AUTHORS"
.IX Header "AUTHORS"
.IP "\(bu" 4
David Golden <dagolden@cpan.org>
.IP "\(bu" 4
Ricardo Signes <rjbs@cpan.org>
.IP "\(bu" 4
Adam Kennedy <adamk@cpan.org>
.SH "COPYRIGHT AND LICENSE"
.IX Header "COPYRIGHT AND LICENSE"
This software is copyright (c) 2010 by David Golden, Ricardo Signes, Adam Kennedy and Contributors.
.PP
This is free software; you can redistribute it and/or modify it under
the same terms as the Perl 5 programming language system itself.