Let users create complex queries with all possible terms([http://xapian.org/docs/glossary.html Xapian glossary]) including system ones. Users can use in query string [[#System prefixes|system]] prefixes and predefined set of [[#Users predefined prefixes|custom]] prefixes.
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Let users create complex queries with all possible terms(see Xapian [http://xapian.org/docs/glossary.html glossary]) including system ones. Users can use in query string [[#System prefixes|system]] prefixes and predefined set of [[#Users predefined prefixes|custom]] prefixes.