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Purpose

An 447258008 $$ Ordered type reference set $$ allows a collection of components to be defined with a specified given a priority ordering. This type of reference ret can also be used to specify ordered associations between different components. These can be used to specify several interrelated subsets of components and to define alternative hierarchies for navigation and selection of concepts or descriptions .

Data structure

An Ordered reference set is an Integer Component reference set is used to represent ordered lists and alternative hierarchies. Its structure is shown in the following table.

Table 22. Ordered reference set - Data structure

 

 

Field

Data type

Purpose

id

UUID

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 effectiveTimes. This allows a reference set member to be modified or made inactive (i.e. removed from the active set) at a specified time.

effectiveTime

Time

The inclusive date or time at which this version of the identified reference set member became the current version.
The current version of this reference set member at time T is the version with the most recent effectiveTime prior to or equal to time T .

active

Boolean

The state of the identified reference set member as at the specified effectiveTime .
If active = 1 (true) the reference set member is part of the current version of the set, if active = 0 (false) the reference set member is not part of the current version of the set.

moduleId

SCTID

Identifies the SNOMED CT module that contains this reference set member as at the specified effectiveTime .
The value must be a subtype of 900000000000443000 $$ Module (core metadata concept) $$ within the metadata hierarchy .

refsetId

SCTID

Identifies the reference set to which this reference set member belongs.
In this case, set to a subtype of 447258008 $$ Ordered type reference set $$

referencedComponentId

SCTID

The identifier of a SNOMED CT component that is included in the ordered list of alternative hierarchy.

order

Integer

Specifies the sort order of the list. The list is ordered by applying an ascending sort of the order value.
The value of order =1 represents the highest priority. A value of '0' is not allowed. Duplicate values are permitted and the sort order between two members with the same order value is not defined.
If the linkedToId value is not 0, sorting occurs within subgroups that share the same linkedToId value.
Note: The name "order" is a reserved word in some database environments. Please consider this when using this column.

linkedToId

SCTID

The identifier of a SNOMED CT component that acts as a grouper or hierarchy node, collecting together a subgroup from within the list.
This field either enables reference set member linked into a number of subgroups. These subgroups can be nested allowing representation of alternative hierarchies.
To link members into a subgroup, all components in the same subgroup should reference the same component. This can either be a component that represents the name of that subgroup or the first member of the subgroup. In the latter case, the first row of each subgroup will contain the same identifier in referencedComponentId and linkedToId and with order =1.
To link a number of children concepts to a single parent concept, one member record should exist per child, with the referencedComponentId field referencing the parent and this field referencing the child concept. The order field is then used to order the children concepts under the parent concept .
For ordered lists that do not require grouping or hierarchical arrangement the value of linkedToId should be the digit zero (0).

Metadata

The following metadata in the "Foundation metadata concept " hierarchy supports this reference set :

Figure 9. Ordered References Sets in the Metadata Hierarchy

Descriptor template and examples

The tables below show the descriptor that defines the structure of the 447258008 $$ Ordered type reference set $$ pattern and an example of descriptor for a specific reference set that follows this pattern.

Table 23. Refset Descriptor rows for 447258008 $$ Ordered type reference set $$

 

 

 

 

refsetId

referencedComponentId

attributeDescription

attributeType

attributeOrder

900000000000456007 $$ Reference set descriptor $$

447258008 $$ Ordered type reference set $$

449608002 $$ Referenced component $$

900000000000460005 $$ Component type $$

0

900000000000456007 $$ Reference set descriptor $$

447258008 $$ Ordered type reference set $$

447255006 $$ Priority order reference set attribute $$

900000000000478000 $$ Unsigned integer $$

1

900000000000456007 $$ Reference set descriptor $$

447258008 $$ Ordered type reference set $$

447257003 $$ "Linked to" reference set attribute $$

900000000000460005 $$ Component type $$

2

Table 24. Refset Descriptor rows for 447570008 $$ SNOMED CT top level navigation hierarchy ordered reference set $$ .

 

 

 

 

refsetId

referencedComponentId (Referenced component)

attributeDescription (Attribute description)

attributeType (Attribute type)

attributeOrder (Attribute order)

 

900000000000456007 $$ Reference set descriptor $$

447570008 $$ SNOMED CT top level navigation hierarchy ordered reference set $$

449608002 $$ Referenced component $$

900000000000461009 $$ Concept type component $$

0

 

900000000000456007 $$ Reference set descriptor $$

447570008 $$ SNOMED CT top level navigation hierarchy ordered reference set $$

900000000000479008 $$ Attribute order $$

900000000000478000 $$ Unsigned integer $$

1

 

900000000000456007 $$ Reference set descriptor $$

447570008 $$ SNOMED CT top level navigation hierarchy ordered reference set $$

447257003 $$ "Linked to" reference set attribute $$

900000000000461009 $$ Concept type component $$

2

 

Note: The table above omits the initial four columns of data present in the release file. These follow the standards versioning pattern id, effectiveTime, active, moduleId. Additionally, to aid understanding, the table above also shows the term from one of the descriptions associated with each of the identified concept. The release file only contains the identifier .

Ordered reference set example

Table 25. Sample content from 447570008 $$ SNOMED CT top level navigation hierarchy ordered reference set $$ .

 

 

 

refsetId

referencedComponentId (Referenced component)

order (Attribute order)

linkedTo ("Linked to" reference set attribute)

447570008 $$ SNOMED CT top level navigation hierarchy ordered reference set $$

64572001 $$ Disease $$

1

123946008 $$ Disorder by body site $$

447570008 $$ SNOMED CT top level navigation hierarchy ordered reference set $$

64572001 $$ Disease $$

2

370117001 $$ Disorder of system $$

447570008 $$ SNOMED CT top level navigation hierarchy ordered reference set $$

64572001 $$ Disease $$

3

278919001 $$ Communication disorder $$

447570008 $$ SNOMED CT top level navigation hierarchy ordered reference set $$

64572001 $$ Disease $$

4

74732009 $$ Mental disorder $$

447570008 $$ SNOMED CT top level navigation hierarchy ordered reference set $$

64572001 $$ Disease $$

5

39898005 $$ Sleep disorder $$

447570008 $$ SNOMED CT top level navigation hierarchy ordered reference set $$

64572001 $$ Disease $$

6

370118006 $$ Disorder of pregnancy / labor / delivery / puerperium $$

447570008 $$ SNOMED CT top level navigation hierarchy ordered reference set $$

64572001 $$ Disease $$

7

370119003 $$ Fetal / neonatal / perinatal disorder $$

447570008 $$ SNOMED CT top level navigation hierarchy ordered reference set $$

64572001 $$ Disease $$

8

370120009 $$ Endocrine / nutritional / metabolic disorder $$

447570008 $$ SNOMED CT top level navigation hierarchy ordered reference set $$

64572001 $$ Disease $$

9

370121008 $$ Disorder of blood / lymphatics / immune system $$

447570008 $$ SNOMED CT top level navigation hierarchy ordered reference set $$

64572001 $$ Disease $$

10

281867008 $$ Multisystem disorder $$


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