Security Definition Request

Tag			Field Name	Req'd	Comments
Component Block <Standard Header>				Y	MsgType = c (lowercase)
320			SecurityReqID	Y
321			SecurityRequestType	Y
Component Block <Instrument>				N	Insert here the set of "Instrument" (symbology) fields defined in "COMMON COMPONENTS OF APPLICATION MESSAGES" of the requested Security
Component Block <Instrument Extension>				N	Insert here the set of "InstrumentExtension" fields defined in "COMMON COMPONENTS OF APPLICATION MESSAGES"
711			NoUnderlyings	N	Number of underlyings
	Component Block <Underlying Instrument>			N	Must be provided if Number of underlyings > 0
15			Currency	N
58			Text	N	Comment, instructions, or other identifying information.
354			EncodedTextLen	N	Must be set if EncodedText field is specified and must immediately precede it.
355			EncodedText	N	Encoded (non-ASCII characters) representation of the Text field in the encoded format specified via the MessageEncoding field.
336			TradingSessionID	N	Optional Trading Session Identifier to specify a particular trading session for which you want to obtain a list of securities that are tradeable.
625			TradingSessionSubID	N
555			NoLegs	N	Number of legs that make up the Security
	Component Block <Instrument Leg>			N	Insert here the set of "InstrumentLeg" (leg-specific symbology) fields defined in "COMMON COMPONENTS OF APPLICATION MESSAGES" Required if NoLegs > 0.
827			ExpirationCycle	N
263			SubscriptionRequestType	N	Subscribe or unsubscribe for security status to security specified in request.
Component Block <Standard Trailer>				Y
XML DTD
<!ENTITY % SecDefReqCustom "" > <!ENTITY % SecDefReqContent "SecReqID, SecReqTyp, Instrmt?, InstrmtExtension?, UndInstrmtGrp*, Ccy?, Text?, EncTextLen?, EncText?, TrdgSessID?, TrdgSessSubID?, InstrmtLegGrp*, ExpirationCycle?, SubReqTyp? %SecDefReqCustom;" > <!ELEMENT SecDefReq (%SecDefReqContent;)> <!ATTLIST SecDefReq FIXMsgType_ENUM CDATA #FIXED "c" Category CDATA #FIXED "SecurityAndTradingSessionDefinitionOrStatus" FIXSpecVolume CDATA #FIXED 'Volume3' FullName CDATA #FIXED "SecurityDefinitionRequest" ComponentType CDATA #FIXED "Message" >