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  • Placing the full SNOMED CT compositional grammar expression in the relevant code field of the message.
    • For example, as noted in section 2.3, the HL7 version 3 CD data type (Release 2) allows the 'code' property to include SNOMED CT expressions [2](see HL7 TermInfo guide).
  • Using an alternative structure for representation of the logical structure of an expression.
    • For example an OWL serialization.
  • Placing a unique expression identifier in the relevant code field of the message
    • This approach requires the use of a shared expression repository enabling the recipient system to look up and resolve this identified to the relevant expression.
  • Decomposing the expression into separate codes that can be placed in different fields within the message structure.
    • This approach assumes alignment between the message structure and the relevant parts of the SNOMED CT concept model.

Please refer to section 8.4 of the SNOMED CT Technical Implementation 5 of the Record Services Guide for more information on exchanging expressions [6].

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