The basic
data structure consists of the following fields:
| Caption label |
|---|
| CapId | basic-reference-set-data-structure |
|---|
| CapType | Table |
|---|
|
Basic Reference Set Data Structure |
Each
is identified and named by a
in the
metadata hierarchy. Therefore the reference set is identified by a concept identifier (an
| Specref |
|---|
| PreSpace | false |
|---|
| RefType | data type |
|---|
| t | SCTID |
|---|
|
).
Each row in a reference set file represents a
.
- Individual reference set members are uniquely identified by a identifier represented as a
| Specref |
|---|
| PreSpace | false |
|---|
| RefType | (data type) |
|---|
| t | UUID |
|---|
|
. - Each reference set member belongs to a single reference set, and it is linked to that reference set by the field.
- Each reference set member is also associated with a single referenced component by its
| Specref |
|---|
| PreSpace | false |
|---|
| RefType | (field) |
|---|
| t | referencedComponentId |
|---|
|
field. The referenced component may be a , , . If the referenced component is a concept that identifies another reference set, that reference set may be considered to be the target of the reference. - Like , reference set members can be versioned to inactivate or change the status of the member. So there may be several rows in a file and in this case the one with the most recent effectiveTime before or equal to the point in time under consideration represents state of that reference set member. If the field of this row is false ('0'), then the reference set member is at that point in time, which means that component it refers to is not a member of the reference set. If the field is true ('1'), then the component referenced by the
| Specref |
|---|
| PreSpace | false |
|---|
| RefType | (field) |
|---|
| t | referencedComponentId |
|---|
|
field is deemed to be a member of the .
The
| Specref |
|---|
| PreSpace | false |
|---|
| RefType | (field) |
|---|
| t | refsetId |
|---|
|
and
| Specref |
|---|
| PreSpace | false |
|---|
| RefType | (field) |
|---|
| t | referencedComponentId |
|---|
|
fields will not change between two rows with the same id, in other words they are immutable. Where a change is required to one of these fields, the current row will be inactivated (by appending a row with the same id and the
field set to false). Another row with a new id will be appended to reference another component.
A component may belong to any number of
. A component may also be referenced by more that one member of the same
. This is not useful in the case of a simple reference set but is relevant for some reference sets. For example, a SNOMED CT concept may map to or from more than on codes in another code system.