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+package Data::MultiValued;
+use strict;
+use warnings;
+# ABSTRACT: store tag- and range-dependant data in a scalar or Moose attribute
+
+warn "Don't use this module directly, use Data::MultiValued::Tags or Data::MultiValued::Ranges or the like";
+
+1;
+
+=head1 SYNOPSIS
+
+  use Data::MultiValued::Tags;
+
+  my $obj = Data::MultiValued::Tags->new();
+  $obj->set({
+    tag => 'tag1',
+    value => 'a string',
+  });
+  say $obj->get({tag=>'tag1'}); # prints 'a string'
+  say $obj->get({tag=>'tag2'}); # dies
+
+Also:
+
+  package My::Class;
+  use Moose;
+  use Data::MultiValued::AttributeTrait::Tags;
+
+  has stuff => (
+    is => 'rw',
+    isa => 'Int',
+    traits => ['MultiValued::Tags'],
+  );
+
+  # later
+
+  my $obj = My::Class->new();
+  $obj->stuff_multi({tag=>'tag1'},123);
+  say $obj->stuff_multi({tag=>'tag1'}); # prints 123
+
+=head1 DESCRIPTION
+
+This set of classes allows you to store different values inside a
+single object, and access them by tag and / or by a numeric value.
+
+Yes, you could do the same with hashes and some clever use of
+arrays. Or you could use L<Array::IntSpan>. Or some other CPAN
+module. Why use these?
+
+=over 4
+
+=item *
+
+they are optimised for serialisation, see
+L<Data::MultiValued::UglySerializationHelperRole> and F<t/json.t>.
+
+=item *
+
+you get accessors generated for your Moose attributes just by setting
+a trait
+
+=item *
+
+tags and ranges interact in sensible ways, including clearing ranges
+
+=back
+
+=head1 Where to go from here
+
+Look at the tests for detailed examples of usage. Look at
+L<Data::MultiValued::Tags>, L<Data::MultiValued::Ranges> and
+L<Data::MultiValued::TagsAndRanges> for the containers
+themselves. Look at L<Data::MultiValued::AttributeTrait::Tags>,
+L<Data::MultiValued::AttributeTrait::Ranges> and
+L<Data::MultiValued::AttributeTrait::TagsAndRanges> for the Moose
+attribute traits.
+