of or to where subtype supertype abstract oneof not in and return then derive optional schema end_schema type entity function rule constant if local repeat begin case end end_type end_entity end_function end_rule end_constant end_if end_local end_repeat end_case else use reference : , || . = ** | <* >= > :=: :<>: [ { ( <= < - <> + / ] } ) * \\ ABS ACOS ASIN ATAN BLENGTH COS EXISTS EXP FORMAT HIBOUND HIINDEX LENGTH LOBOUND LOINDEX LOG LOG2 LOG10 NVL ODD ROLESOF SIN SIZEOF SQRT TAN TYPEOF USEDIN VALUE VALUE_IN VALUE_UNIQUE QUERY CONST_E PI SELF binary boolean integer logical number real string enumeration select array list bag set generic