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=item C<< The number of items within the array ref must be >=1 . Seen ... >>

You passed an empty reference to the constructor.

    my $nodes = new Data::NestedSet([],2);              # error
    my $nodes = new Data::NestedSet([[1,'ROOT',0]],2);  # ok


=item C<< An integer must be supplied as the second argument. Seen ... >>

You didn't supply a proper depth's offset value within the array reference.

    my $nodes = new Data::NestedSet(\@array);         # error
    my $nodes = new Data::NestedSet(\@array,"wrong"); # error
    my $nodes = new Data::NestedSet(\@array,2);       # ok

=back


=head1  SEE ALSO

=over 

=item B<explanation of the nested set model>

http://dev.mysql.com/tech-resources/articles/hierarchical-data.html
(Managing Hierarchical Data in MySQL)

Even though, it is written for mysql rdb, the explanations are worth a look.

=item B<other related modules>

L<Table::ParentChild>
L<Tree::DAG_Node>
L<Sort::Tree>
L<DBIx::Tree>
L<DBIx::Tree::NestedSet>

None of this modules allows you to create a nested model 
from the depth but are related to some extends.

=back

=head1  CONFIGURATION AND ENVIRONMENT

none


=head1  DEPENDENCIES

none

=head1  INCOMPATIBILITIES

none



=head1 BUGS AND LIMITATIONS

If you do me the favor to _use_ this module and find a bug, please email me
i will try to do my best to fix it (patches welcome)!

=head1 AUTHOR

Shirirules E<lt>shiriru0111[arobas]hotmail.comE<gt>

=head1 LICENSE AND COPYRIGHT

This library is free software; you can redistribute it and/or modify
it under the same terms as Perl itself.

=cut