#### Child Screening
Domain Message Specification

### Associated Specifications

Generic CDA The Generic CDA Domain Message Specification contains details on the "on-the-wire" format for CDA payloads. The "on-the-wire" format is the actual payload structure that is sent to a recipient. The Generic CDA Domain Message Specification documents two "on-the-wire" CDA formats. The first is for use over the Transaction Messaging System (TMS) when using TMS wrappers, this is documented in the Generic CDA Domain Message Specification as "NPfIT CDA RMIM - POCD_MT000001UK04". The second is used for non-TMS usage and is documented in the Generic CDA Domain Message Specification as "NHS CDA RMIM - POCD_MT000002UK01".
Nullification The Nullification Domain Message Specification contains details on how to nullify a CDA document that was, for example, sent in error or a document that is not accepted by a recipient. The domain specifies the message definition of the nullification document ("Nullification Document - POCD_MT130001UK05"), which is generically used to nullify any CDA document.
Distribution Envelope The Distribution Envelope Specification defines the constraints to be applied to the distribution envelope when used with ITK Correspondence content.
Technical Guidance for Templated CDA Domains Technical Guidance for Templated CDA Domains gives detailed technical information required to implement a HSCIC CDA templated domain. This document only forms part of the documentation required to implement a HSCIC CDA domain and should be used in conjunction with the message specification and the domain baseline document set.
CDA Implementation Guidance Narrative Block Tags This pack gives guidance on the use of tags and attributes used in a CDA text section (also called CDA markup).The content of this pack is based on the schema "NarrativeBlock.xsd", which is included in Domain Message Specifications in the "dt" folder. This schema is included in the Generic CDA and Profile schemas to ensure the correct CDA mark-up has been applied to the text element within the section class.
ITK Business Acknowledgement This Domain Message Specification documents the business acknowledgement for use within ITK messaging. The business acknowledgement is triggered by the presence of a handling specification with a key "urn:nhs-itk:ns:201005:ackrequested" and value set to "true" in the distribution envelope of a received transmission. The business acknowledgement is sent using the service "SendBusinessAck-v1-0". A key feature of the ITK Business Acknowledgement is that it is capable of acknowledging individual payloads within a received message.