Translations:Help:CirrusSearch/369/en

A filter can also run standalone because it can filter a search domain. For example a namespace is not a filter (not a Y/N evaluation), it is a search domain. Similarly, the inlanguage: parameter is not a filter, but it is a language "namespace" (comparable to our title "namespace"). (See Prefix and namespace above for $inlang.) A namespace or an $inlang parameter are not meant for standalone queries; a filter is.