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=head1 NAME
Lucy::Index::LexiconReader - Read Lexicon data.
=head1 SYNOPSIS
my $lex_reader = $seg_reader->obtain("Lucy::Index::LexiconReader");
my $lexicon = $lex_reader->lexicon( field => 'title' );
=head1 DESCRIPTION
LexiconReader reads term dictionary information.
=head1 ABSTRACT METHODS
=head2 lexicon( I<[labeled params]> )
Return a new Lexicon for the given C<< field >>. Will return
undef if either the field is not indexed, or if no documents contain a
value for the field.
=over
=item *
B<field> - Field name.
=item *
B<term> - Pre-locate the Lexicon to this term.
=back
=head2 doc_freq( I<[labeled params]> )
Return the number of documents where the specified term is present.
=head1 INHERITANCE
Lucy::Index::LexiconReader isa L<Lucy::Index::DataReader> isa Clownfish::Obj.
=cut