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The DSC segment is used in the continuation protocol.

HL7 Attribute Table - DSC - continuation pointer segment

Seq#	DataElement	Description	Must Implement	Flags	Cardinality	Length	C.LEN	Vocabulary	DataType
DSC
1	00014	Continuation Pointer		=	[0..1]		180		ST
2	01354	Continuation Style			[0..1]	[1..1]		0398 Continuation Style Code	ID

(Definition from DSC.1 in Ch. 2)

Definition: This field contains the continuation pointer. In an initial query, this field is not present. If the responder returns a value of delete indicator or not present, then there is no more data to fulfill any future continuation requests. For use with continuations of unsolicited messages, see chapter 5 and section 2.10.2, "Continuation messages and segments." Note that continuation protocols work with both display- and record-oriented messages.

(Definition from MSH.14 in Ch. 2)

Definition: This field is used to define continuations in application-specific ways.

Only the sender of a fragmented message values this field.

Definition: Indicates whether this is a fragmented message (see Section 2.10.2, "Continuation messages and segments"), or if it is part of an interactive continuation message (see Section 5.6.3, "Interactive continuation of response messages").

Refer to HL7 Table 0398 – Continuation Style Code in Chapter 2C, Code Tables, for valid values.