<data type="string"> <documentation xml:lang="en" xml:space="preserve">A query The syntax is as follows (described in terms of [CSS grammar](https://www.w3.org/TR/CSS21/grammar.html)): query : feature* ; feature : '(' S* IDENT S* [ ':' S* value ]? ')' S* ; value : string | integer | IDENT ; </documentation> <param name="pattern">^\s*(\(\s*[_a-zA-Z][_a-zA-Z0-9-]*(\s*:\s*([_a-zA-Z][_a-zA-Z0-9-]*|'[^']*'|"[^"]*"|0|-?[1-9][0-9]*))?\s*\)\s*)*$</param> </data>