Purpose

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

Data structure

Anis aused to represent associations between. Its structure is shown in the following table.

Table 50. Association reference Set - Data structure
Field	Data type	Purpose
id (field)	UUID (data type)	A 128 bit unsigned Integer (data type), uniquely identifying this. Different versions of a reference set member share the same id (field) but have different effectiveTime (field). This allows a reference set member to be modified or made active (field) (i.e. removed from the active set) at a specified time.
effectiveTime (field)	Time (data type)	The inclusive date or time at which this version of the identifiedbecame the current version. The current version of thisat time T is the version with the most recent effectiveTime (field) prior to or equal to time T .
active (field)	Boolean (data type)	The state of the identifiedas at the specified effectiveTime (field) . If active (field) = 1 (true) theis part of the current version of the set, if active (field) = 0 (false) theis not part of the current version of the set.
moduleId (field)	SCTID (data type)	Identifies thethat contains thisas at the specified effectiveTime (field) . The value must be aof 900000000000443000 \|Module (core metadata concept)\| within the metadata.
refsetId (field)	SCTID (data type)	Identifies theto which thisbelongs. In this case, set to aof 900000000000521006 \|Association type reference set\| . This indicates the nature of the association between the source and target.
referencedComponentId (field)	SCTID (data type)	The identifier of the sourceof the association.
targetComponentId (field)	SCTID (data type)	The identifier of the targetof the association.

Metadata

The following metadata in the "Foundation metadata"supports this:

900000000000455006 |Reference set|
- 900000000000521006 |Association type|
  - 900000000000522004 |Historical association|

Figure 16. Association Reference Sets in the Metadata Hierarchy

Notes on usage

Each member of a |Historical association| represents a Reference from anto other equivalent or relatedthat were current in thein which thatwas inactivated.

Each |Historical association| holdsof a different nature between the. The |Historical association| contains associations:

from eachto one or more otherthat are current in thein which thewas inactivated;
from each inactivefor which there is a current replacement to the replacement;
from anto athat is current in thein which thewas inactivated, and which is correctly described by the Term of the;
From eachto one or morethat replace it.

Theidentified by the targetComponentId (field) must be an instance of the same class ofas theidentified by the referencedComponentIdfor all |Historical association|apart from the |REFERS TOassociation|.

Within the |REFERS TOassociation|, the referenced ComponentId field must be aand the targetComponentIdmust be a.

The targetComponentId (field) is used differently in the |MOVED TO association|. In this case, the targetComponentId (field) does not refer directly to a replacement, but rather to the namespace to which thewas moved to. The targetComponentId (field) actually refers to thethat represents the namespace. This approach is used since the organization sourcing themay not always be able to determine the precise reference that is applicable in the receiving organization (namespace). Thus the responsibility for these references lies with the new responsible (receiving) organization.

See also more further information about 4.2.3 Historical Association Reference Sets.

Descriptor template and examples

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

Table 51. Refset Descriptor rows for 900000000000527005 \|SAME AS association reference set\| .
refsetId	referencedComponentId (Referenced component)	attributeDescription (Attribute description)	attributeType (Attribute type)	attributeOrder (Attribute order)
900000000000456007 \|Reference set descriptor\|	900000000000527005 \|SAME AS association reference set\|	900000000000532006 \|Association source component\|	900000000000460005 \|Component type\|	0
900000000000456007 \|Reference set descriptor\|	900000000000527005 \|SAME AS association reference set\|	900000000000533001 \|Association target component\|	900000000000460005 \|Component type\|	1
Table 52. Refset Descriptor rows for 900000000000531004 \|REFERS TO concept association reference set\| .
refsetId	referencedComponentId (Referenced component)	attributeDescription (Attribute description)	attributeType (Attribute type)	attributeOrder (Attribute order)
900000000000456007 \|Reference set descriptor\|	900000000000531004 \|REFERS TO concept association reference set\|	900000000000532006 \|Association source component\|	900000000000460005 \|Component type\|	0
900000000000456007 \|Reference set descriptor\|	900000000000531004 \|REFERS TO concept association reference set\|	900000000000533001 \|Association target component\|	900000000000460005 \|Component type\|	1

Note: The tables above omit the initial four columns of data present in the release file. These follow the standards versioning pattern id (field), effectiveTime (field), active (field), active (field). Additionally, to aid understanding, the tables above also show thefrom one of theassociated with each of the identified. The release file only contains the.

Association reference set example

The following table holds example entries for the |Replaced by| .

Table 53. Sample content from 900000000000526001 \|REPLACED BY association reference set\| .
refsetId	referencedComponentId (Association source component)	targetComponentId (Association target component)
900000000000526001 \|REPLACED BY association reference set\|	100005 \|SNOMED RT Concept\|	138875005 \|SNOMED CT Concept\|
900000000000526001 \|REPLACED BY association reference set\|	212002 \|Salmonella III arizonae 53:k:z\|	398450001 \|Salmonella IIIb 53:k:z\|
900000000000526001 \|REPLACED BY association reference set\|	225005 \|Special care of patient with contagious disease\|	133895001 \|Care of patient with infectious disease\|
900000000000526001 \|REPLACED BY association reference set\|	244003 \|Evans and Lloyd-Thomas syndrome\|	66659007 \|Normal variation in position\|
900000000000526001 \|REPLACED BY association reference set\|	278009 \|Epidural injection of neurolytic substance, lumbar\|	17753007 \|Epidural injection of neurolytic solution, lumbar\|
900000000000526001 \|REPLACED BY association reference set\|	558000 \|Other disorder of the neurohypophysis, NEC\|	72442006 \|Disorder of posterior pituitary\|
900000000000526001 \|REPLACED BY association reference set\|	659001 \|Peptostreptococcus anaerobius\|	413524006 \|Anaerococcus tretradius\|
900000000000526001 \|REPLACED BY association reference set\|	696005 \|Chronobiologic disorder\|	387605007 \|Abnormal chronobiologic state\|
900000000000526001 \|REPLACED BY association reference set\|	700002 \|Salmonella III arizonae 50:z4,z23,z32:--\|	404619004 \|Salmonella IIIa 50:z4,z23,z32:-\|
900000000000526001 \|REPLACED BY association reference set\|	822000 \|Salmonella arizonae 53:z4,z23:--\|	13998005 \|Salmonella IV 53:z4,z23:--\|