The Wikipedia objects contain just one indexed column:
Queries can combine conditions on these columns according to the syntax described below.
Here are a few examples:
tokens matches 'pyramid scheme' tokens matches 'hedge funds' fraud tokens matches diabetes control tokens matches proximity 20 [cancer aspirin] (prevent | prevention | evidence) tokens matches proximity 20 ((prostate) & (cancer) & (treatment therapy surgery))
The following rules in BNF-like notation specify the full query syntax:
condition: match | NOT match | match relOp condition match:ident matches pattern | ( condition ) | comparison pattern: attr patternOp pattern | attr pattern | attr attr: color = primary | primary | tagged tagged: tag : * | tag : primary tag: tagType /> tagValue tagType: POS | MORPH | WSJ | IEER | DEP color: ident ident: WORD primary: ( pattern ) | ~ primary | WORD | WORDSTAR | PHRASE | proximity proximity: proximity dist ( proxlist ) | proximity dist [ proxphrases ] dist: INT proxlist: ( wordlist ) & proxlist | ( wordlist ) wordlist: WORD wordlist | WORD proxphrases: proxphrases STRING | proxphrases WORD | STRING | WORD relOp: AND | OR patternOp: && | || comparison: operand = operand | operand != operand | operand < operand | operand <= operand | operand > operand | operand >= operand | operand between operand and operan d | operand not between operand and op erand operand: field | INT | FLOAT | STRING field: ident