09.04.2013 Views

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

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

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

SHOW MORE
SHOW LESS

You also want an ePaper? Increase the reach of your titles

YUMPU automatically turns print PDFs into web optimized ePapers that Google loves.

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

In 2003-2004, some relationship types were packaged into a separate file called the Historical Relationships<br />

Table. These relationship types were merged into the Relationships Table starting with the January 2005<br />

release.<br />

3.2.4. Subset Mechanism<br />

A Subset refers to a set of Concepts, Descriptions, or Relationships that are appropriate to a particular<br />

language, dialect, country, specialty, organization , user or context.<br />

In its simplest form, the Subset Mechanism is a list of <strong>SNOMED</strong> CT Identifiers (SCTIDs). Each SCTID refers<br />

to one component of <strong>SNOMED</strong> CT that is a member of the Subset (called a "Subset Member"). As an analogy,<br />

think of <strong>SNOMED</strong> CT is a book. A Subset is like an index entry pointing to a set of pages relevant to a particular<br />

topic.<br />

The Subset Mechanism may be used to derive tables that contain only part of <strong>SNOMED</strong> CT. In some cases,<br />

these derived tables may also be centrally distributed (e.g. a release table containing only Descriptions for a<br />

particular International Edition). Please refer to <strong>Release</strong>d Subsets (3.2.4.3) for a list of subsets now available.<br />

<strong>SNOMED</strong> CT provides for the Subset Types listed below. Some of these types are not yet in use.<br />

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

Hooray! Your file is uploaded and ready to be published.

Saved successfully!

Ooh no, something went wrong!