type t = {mutable request_id : Dtcprotocol_piqi.protobuf_int32 option;mutable symbol : string option;mutable exchange : string option;mutable security_type : Dtcprotocol_piqi.security_type_enum option;mutable description : string option;mutable min_price_increment : Dtcprotocol_piqi.float32 option;mutable price_display_format : Dtcprotocol_piqi.price_display_format_enum
option;mutable currency_value_per_increment : Dtcprotocol_piqi.float32 option;mutable is_final_message : bool option;mutable float_to_int_price_multiplier : Dtcprotocol_piqi.float32 option;mutable int_to_float_price_divisor : Dtcprotocol_piqi.float32 option;mutable underlying_symbol : string option;mutable updates_bid_ask_only : bool option;mutable strike_price : Dtcprotocol_piqi.float32 option;mutable put_or_call : Dtcprotocol_piqi.put_call_enum option;mutable short_interest : Dtcprotocol_piqi.uint32 option;mutable security_expiration_date : Dtcprotocol_piqi.int32_fixed option;mutable buy_rollover_interest : Dtcprotocol_piqi.float32 option;mutable sell_rollover_interest : Dtcprotocol_piqi.float32 option;mutable int_to_float_quantity_divisor : Dtcprotocol_piqi.float32 option;mutable has_market_depth_data : bool option;mutable display_price_multiplier : Dtcprotocol_piqi.float32 option;mutable exchange_symbol : string option;mutable initial_margin_requirement : Dtcprotocol_piqi.float32 option;mutable maintenance_margin_requirement : Dtcprotocol_piqi.float32 option;mutable currency : string option;mutable contract_size : Dtcprotocol_piqi.float32 option;mutable open_interest : Dtcprotocol_piqi.uint32 option;}