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=head1 NAME

Lucy::Index::PostingListReader - Read postings data.

=head1 SYNOPSIS

    my $posting_list_reader 
        = $seg_reader->obtain("Lucy::Index::PostingListReader");
    my $posting_list = $posting_list_reader->posting_list(
        field => 'title', 
        term  => 'foo',
    );



=head1 DESCRIPTION

PostingListReaders produce L<PostingList|Lucy::Index::PostingList>
objects which convey document matching information.



=head1 ABSTRACT METHODS

=head2 posting_list( I<[labeled params]> )

Returns a PostingList, or undef if either C<< field >> is undef or
C<< field >> is not present in any documents.

=over

=item *

B<field> - A field name.

=item *

B<term> - If supplied, the PostingList will be pre-located to this
term using seek().

=back





=head1 INHERITANCE

Lucy::Index::PostingListReader isa L<Lucy::Index::DataReader> isa L<Lucy::Object::Obj>.


=cut