Xapian::TermGenerator *term_gen;
Xapian::ValueRangeProcessor *value_range_processor;
Xapian::ValueRangeProcessor *date_range_processor;
Xapian::TermGenerator *term_gen;
Xapian::ValueRangeProcessor *value_range_processor;
Xapian::ValueRangeProcessor *date_range_processor;