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Purpose

An 900000000000521006 | Association type reference set| represents a set of unordered associations of a particular type between components.

Data structure

An Association reference setis a reference setused to represent associations between components. Its structure is shown in the following table.

Field

Data type

Purpose

Part of Primary Key

id

A 128 bit unsigned Integer, uniquely identifying this reference set member.

Different versions of a reference set member share the same id but have different effectiveTime. This allows a reference set member to be modified or made active (i.e. removed from the active set) at a specified time.

NO

YES (Full/Snapshot) 

effectiveTime

Time

The inclusive date or time at which this version of the identified reference set memberbecame the current version.

The current version of this reference set memberat time T is the version with the most recent effectiveTime prior to or equal to time T .

YES

YES (Full)

Optional (Snapshot) 

active

Boolean

The state of the identified reference set memberas at the specified effectiveTime .

If active = 1 (true) the reference set memberis part of the current version of the set, if active = 0 (false) the reference set memberis not part of the current version of the set.

YES

NO

moduleId

SCTID

Identifies the SNOMED CT modulethat contains this reference set memberas at the specified effectiveTime .

The value must be a subtypeof 900000000000443000 | Module (core metadata concept)| within the metadata hierarchy.

YES

NO

refsetId

SCTID

Identifies the reference setto which this reference set memberbelongs.

In this case, set to as subtype descendant of: ??

NONO

referencedComponentId

SCTID

A reference to the SNOMED CT componentto be included in the reference set.

NONO

targetComponentId

SCTID

The identifier of the target componentof the association.

NONO

Metadata

The following metadata supports this reference set:


  
900000000000455006 |Reference set|
        
900000000000521006 |Association type|
                
900000000000522004 |Historical association|
                        
900000000000523009 |POSSIBLY EQUIVALENT TO association reference set|
                        
900000000000524003 |MOVED TO association reference set|
                        
900000000000525002 |MOVED FROM association reference set|
                        
900000000000526001 |REPLACED BY association reference set|
                        
900000000000527005 |SAME AS association reference set|
                        
900000000000528000 |WAS A association reference set|
                        
900000000000529008 |SIMILAR TO association reference set|
                        
900000000000530003 |ALTERNATIVE association reference set|
                        
900000000000531004 |REFERS TO concept association reference set|

Historical Association Rules and Guidance

Each member of a 900000000000522004 | Historical association|  reference set represents a reference from an inactive componentto other equivalent or related componentsthat were current in the Release Versionin which that componentwas inactivated.

Each 900000000000522004 | Historical association|  reference set represents a different type of association between the components referred to by the referencedComponentId and the targetComponentId as shown in .

Association reference set

Descriptions

Applies to a concept that is ambiguous. The targetComponent is an active concept that represents one of the possible meanings of the inactive concept . Multiple rows are used to refer to each of the possible meanings of the ambiguous concept.

Applies to a component that has been moved to (or are pending a move to) another namespace. The targetComponent identifies the target namespace (not the new component ).

Applies to a component that has been moved to this namespace from another namespace. The targetComponent identifies the original componentIdentifier in its previous namespace.

Applies to an erroneous, obsolete and other inactive component for which there is a single active replacement. The targetComponent identifies the active component that replaces this component.

Applies to a component that is a duplicate. The targetComponent identifies the active component that this component duplicates.

Links an inactive classification concept such as "not otherwise specified" or "otherwise specified" with the active concept that was formerly its most proximal supertype.

(not used currently)

Links an inactive classification concept derived from ICD-9 Chapter XVI "Symptoms signs and ill-defined conditions" with the most similar active concept.

Applies to an inactive description which is inappropriate to the concept  it is directly linked to but instead should refer to the concept referenced by the targetComponent.

The componentidentified by the targetComponentId must be an instance of the same class of componentas the componentidentified by the referencedComponentId for all |Historical association| reference setsapart from the |REFERS TO conceptassociation reference set|.

Reference Set Descriptor and Example Data

Notes on the tables used to show descriptors and examples

The reference set example tables on this page have been revised as follows to aid clarity and understanding:

  • The first four columns which are present in all release files are not shown. The omitted columns (ideffectiveTimeactivemoduleId) are used in the same way in all referenced sets to support identification, versioning and packaging. They do not directly affect the specific features of a particular reference set or reference set type.
  • Reference set columns that contain SNOMED CT identifiers are expanded to show details of the concept or description referenced by that identifier. In some cases, the term is shown in the same column using the expression syntax, in other cases an additional column with a name suffix '_term' has been added. In the standard reference set files only the identifier is present in the column and there is no added column for the term. When using reference sets, the term and other details of the component are looked up from the relevant component release files.

Descriptor Template

The tables below show examples of the descriptors for specific reference setsthat follow the 900000000000521006 | Association type reference set| pattern.

Example Data

The following table holds example entries for the  900000000000526001 | REPLACED BY association reference set| .

refsetId

referencedComponentId (Association source component)

targetComponentId (Association target component)

Relevant References


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