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Returns all language tags that are alternate forms of
language:

alternate_language_tags('en'); # Returns ()
alternate_language_tags('he'); # Returns ('iw')
alternate_language_tags('iw'); # Returns ('he')

Returns the encoding of a language tag. Returns
undef if language is
invalid.

Returns a list of what is perceived as valid language tags from
source. For example:

my $chewbacca_dialect = 'growl, growl, fr, growl, growl!';
extract_language_tags($chewbacca_dialect);
# Returns 'fr' Chewbacca is French?! Say it isn't so!

Returns true if lang1 represents a form of
lang2. It doesn't go both
ways, so make sure that lang1 comes first.

is_dialect_of('en-US', 'en'); # true
is_dialect_of('en', 'en-US'); # false

Returns true if language is a valid language tag. For example:

my $gutteral = 'Chewbacca';
is_language_tag($gutteral); # false
my $pourquois = 'fr';
is_language_tag($pourquois); # true

Takes a locale name and maps it to a language tag. Certain tags
aren't mappable, such as C or
POSIX, in which case
local2language_tag will return an empty list.

locale2language_tag('en'); # Returns 'en'
locale2language_tag('POSIX'); # Returns undef or ()

Returns true if lang1 and
lang2 both represent the same language
form. For example:

same_language_tag('en', 'en-US'); # Returns false
en != en-US

Returns an integer that represents the degree of similarity between
lang1 and
lang2:

similarity_language_tag('fr', 'fr-ca'); # 1
similarity_language_tag('fr', 'en-US'); # 0

Returns a list of language tags that are superordinate to
language:

super_languages('en-US'); # Gets 'en'
super_languages('en'); # Gets an empty list

8.121. I18N::Langinfo		8.123. I18N::LangTags::List