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Since then, two important developments have occurred. Firstly, in 2012 a new standard distribution format for SNOMED CT (Release Format 2) began to be used. Release Format 2 (RF2) included a few key enhancements, including more robust and consistent version representation, an extensibility mechanism called 'reference sets', and a new hierarchy to represent metadata about the structure of SNOMED CT. Secondly, in 2015, the first official version of the Expression Constraint Language was published, replacing earlier informal constraint representations. These two developments have provided the opportunity for the SNOMED CT MRCM to be developed in a more standardized, consistent and version controlled way than was previously possible.

The In January 2017, the beta release of the international SNOMED CT MRCM was published, and a period of community evaluation followed.

The first has now been published. It is anticipated that the production version of the international SNOMED CT MRCM will be released as part of the July release (20170731) of the SNOMED CT international edition from July 2017.

Purpose

The purpose of this document is to define and describe the structural design of the SNOMED CT MRCM, and to discuss the background and considerations that were taken into account during its design. 

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This document presents the design of the SNOMED CT MRCM. Chapter 2 begins by describing the use cases in which it is anticipated that the SNOMED CT MRCM may be used. Chapter 3 then describes the requirements used to guide the MRCM design. The logical design of the MRCM is then described in Chapter 4, followed by the design of the reference sets used to distribute the MRCM rules in Chapter 5. Chapter 6 then discusses a range of topics that were considered in the design of the MRCM, and Chapter 8 lists some relevant references.

Glossary

The following table contains the definition of terms used within this document. Please refer to the SNOMED Glossary for additional definitions.

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