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Hence, reference sets are a mechanism that can be used to represent subsets and value sets of SNOMED CT components. However, they can also be used for many other purposes, including those summarized in 3.2. Use Cases. The following table lists the attributes used in the standard reference set format, and their purpose.

AttributePurpose
id

 General versioning information

effectiveTime

active

moduleId

refsetId

Reference set identifier

referencedComponentId

Component reference

<attribute-1 

  … attribute-n>

Additional information depending on reference set type

Reference Sets in an Extension

SNOMED CT is designed to allow the

Gloss
Spacetrue
tInternational Edition
to be extended to meet national or local requirements. A
Gloss
Spacetrue
tSNOMED CT Extension
may contain components of various types including
Gloss
Spacetrue
tconcepts,
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Spacetrue
tdescriptions,
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Spacetrue
trelationships
and derivatives including 
Gloss
Spacetrue
treference sets.
Since the International Release and extensions share a common structure, the same application software can be used to enter, store and process information from different extensions. Extensions can also be shared without requiring additional software procurement or development.  Most Extensions E xtensions are managed by Members by  Members or Affiliates of SNOMED International.

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