Update RIM description of ExecutionAndDeliveryTime

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Recommendation for HL7 RIM Change	RECOMMENDATION ID:
Sponsored by: InM - Infrastructure and Messaging	Approval date by committee: to be approved
Revision (# and date): n.a. - see Wiki history page	Date submitted:
Editor/Author: René Spronk
PROPOSALNAME: Update RIM description of ExecutionAndDeliveryTime

Stewards Position

REQUIRED - This table should contain one row for each Steward Committee affected by the recommendation.

TC	RECOMMENDATION APPROVAL STATUS	AFFECTED ENTITIES OF INTEREST TO TC (responsibility level: S=Steward; I=Interested)
InM - Infrastructure and Messaging	Approved (See Extend usage of ExecutionAndDeliveryTime)	S

Issue

Redefine (in a backwards compatibe fashion) the description of the QueryByParameter.executionAndDeliveryTime attribute in the RIM.

The current definition doesn't specify how the attribute should be interpreted in the case of a Deferred or Immediate query. HL7 version 2 contains a definition for its interpretation within Deferred queries; this proposal seeks to add a definition of its interpration in Immediate queries.

For Immediate queries executionAndDeliveryTime should be interpreted as the point in time before which the responding system should have send a response. This to avoid waiting for an undefined period of length by a system that has just sent a query. The responding system may elect to send a query-response with zero results in it, forcing the querying system to send a 'query continuation interaction' to get hold of a next part of the result set.

Recommendation(s)

Change the defintion of the executionAndDeliveryTime as shown below:

RIM Recommendation(s)

Change the current definition of executionAndDeliveryTime from

3.6.10.7 QuerySpec.executionAndDeliveryTime:: TS (0..1)
Definition:Specifies the time the response is to be returned.

to

3.6.10.7 QuerySpec.executionAndDeliveryTime:: TS (0..1)
Definition: Specifies the time the response is to be returned. If the query priority is Deferred, then
executionAndDeliveryTime should be interpreted as the point in time when the response should be sent.
If the query priority is Immediate executionAndDeliveryTime should be interpreted as the 
point in time before which the responding system should have send a response. 

The proposed change is backwards compatible.

The semantics of the above description for Deferred queries is based on the corresponding v2 field:

Definition of RCP-4:

5.5.6.4    RCP-4   Execution and Delivery Time   (DTM)   01441
Definition:  Specifies the time the response is to be returned.  This
field is only valued when RCP-1-Query priority contains the value D
(Deferred).

Vocabulary Recommendation(s)

• Not applicable.

Rationale

• The specification of a 'timeout' fits within the current description of the semantics of this attribute. The alternative would be to create a new attribute - this isn't seen as a necessity given the semantic match.
• A similar proposal has been approved for HL7 version 2. The definition of RCP-4 will be changed for those cases where

Recommended Action Items

• Implement the proposed solution

Discussion

• See Extend usage of ExecutionAndDeliveryTime for the original InM proposal, and motion of approval of the proposal.