Optional Readonly$allOptional Readonly$elemOptional Readonly$eqOptional Readonly$existsOptional Readonly$gtOptional Readonly$gteOptional Readonly$inOptional Readonly$ltOptional Readonly$lteOptional Readonly$neOptional Readonly$ninOptional Readonly$notOptional Readonly$sizeOptional Readonly$type
Declares field comparisons and array, type, and existence predicates.