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SNOMED CT® Release Format 1 (RF1) Guide - ihtsdo

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46 | <strong>SNOMED</strong> CT <strong>Release</strong> <strong>Format</strong> 1 (<strong>RF1</strong>) <strong>Guide</strong> July 2012<br />

Figure 17: General Abstract Logical Model of a <strong>SNOMED</strong> CT expression<br />

2.2.2.1. Refinement<br />

An expression represents an instance of the meaning defined of the focus concepts are as modified by the<br />

refinements.<br />

Various types of refinement are possible. Of these some are fully supported by the <strong>SNOMED</strong> CT Concept<br />

Model and released data while other possible methods of refinement step outside those boundaries.<br />

2.2.2.1.1. Refinement of defining Relationships<br />

2.2.2.1.1.1. Refinement individual attribute values<br />

A defining relationship of the base concept can be refined by applying a value that is a subtype of the defining<br />

value.<br />

This approach to refinement is fully supported by the <strong>SNOMED</strong> CT Concept Model.<br />

Defining relationships that are marked with the refinability property value "not refinable" should not be refined.<br />

© 2002-2012 International Health Terminology Standards Development Organisation CVR #: 30363434

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