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Current File : /lib/x86_64-linux-gnu/perl5/5.36/Net/IDN/Overview.pod
=encoding utf8

=head1 NAME

Net::IDN::Overwiew - Internationalized Domain Names for Applications (IDNA)

=head1 DESCRIPTION

The C<Net::IDN::*> modules provide a framework for the handling of
Internationalized Domain Names for Applications (IDNA) in perl programmes.

This document provides an overview of the available modules in order to 
allow you to choose the best module for the task at hand.

=head2 AVAILABLE MODULES

=head3 HIGH-LEVEL (USE THIS)

=over

=item L<Net::IDN::Encode>

provides a high-level interface for converting domain names (and
for convenience, email addresses).  

Use this module if you just want to convert domain names and don't
care about how this is done internally.

Currently, this module uses L<Net::IDN::UTS46>. However, this
might change in the future if another specification (e.g. a
revision of IDNA2008) becomes more appropriate.

The author aims for Net::IDN::Encode to always use the specification that will
provide the "least surprising" results.

=back

=head3 STANDARD-SPECIFIC

These modules implement different versions of the the IDNA
specifications. Use one of these modules only if you require
compatibility with a specific incarnation of IDNA.

=over

=item L<Net::IDN::IDNA2003>

implements the original IDNA specification, released in 2003
(IDNA2003), which is now obsolete.

IDNA2003 is defined in RFC 3490 L<http://tools.ietf.org/rfc/3490>
and related documents.

=begin comment

=item L<Net::IDN::IDNA2008>

implements the current IDNA specification, released in early 2010
(IDNA2008 or IDNAbis). 

Please note that this module will not allow you to convert some
domain names, such as C<√.com> or C<I♥NY.com>, which were allowed
in IDNA2003 but are disallowed in IDNA2008.

IDNA2008 is defined in RFC 5890 L<http://tools.ietf.org/rfc/5890>
and related documents.

=end comment

=item L<Net::IDN::UTS46>

implements Unicode Technical Standard #46 (UTS #46
L<http://unicode.org/reports/tr46/>), Unicode IDNA Compatibility
Processing.  This specification supports all domain names allowed
under either IDNA2003 or IDNA2008. 

=back

=head3 ENCODING

=over

=item L<Net::IDN::Punycode>

performs the actual conversion between the ASCII and Unicode form
of strings.  Punycode is defined in RFC 3492
L<http://tools.ietf.org/rfc/3492> and related documents.

Usually, it is not a good idea to use this module directly. If you
convert domain labels (or other strings) without proper
preparation, you may end up with an ASCII encoding that is not
interoperable or poses security issues due to spoofing.

Even if you think that your domain names are valid and in
already-mapped format, you might be fooled by different Unicode
normalization forms (for example, some environments might
automatically convert your data to NFD, which breaks IDNA).

=back

=head3 DEPRECATED/COMPATIBILITY

These modules are only maintained in order to not break
applications that might rely on them

=over

=item L<Encode::Punycode>

provides an L<Encode> plugin for Punycode. As Punycode is not a
general-purpose encoding, there are limited applications.

=item L<IDNA::Punycode>

has an API depending on global variables. Don't use this module.

=back

=head2 DISTRIBUTIONS

=over

=item Net-IDN-Encode

is the main distribution covering the most common cases for
converting domain names between ASCII and Unicode.

The author tries to keep the dependency chain as small as possible; currently
this distribution only depends on perl 5.8.5 (including the core module
L<Unicode::Normalize> ). 

=item Net-IDN-IDNA2003

provides the L<Net::IDN::IDNA2003> module. This is separate
because it has an dependency on L<Unicode::Stringprep> (through
L<Net::IDN::Nameprep>).

=begin comment

=item Net-IDN-IDNA2008

provides the L<Net::IDN::IDNA2008> module. This is separate because it has an
dependency on perl 5.10 or higher (through L<Unicode::Precis>).

=end comment

=item Encode-Punycode

=item IDNA-Punycode

are separate because they are of limited use to the average
user/perl programmer.

=back

=head1 AUTHOR

Claus FE<auml>rber <CFAERBER@cpan.org>

=cut

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