# Logical Record Architecture for Health and Social Care
## Discharge Summary Release 0.02

Contents
The content of this release is not comprehensive and is not fully validated and must not be used in live system implementations.
# Reference Model Class: CLUSTER
This class represents the hierarchical organisation of the data structure of each ITEM within an ENTRY, to permit the nesting or grouping of ELEMENTs with the same obs_time, or of one item_category or to organise rows of tabular data. ## Specializes ## ITEM ## Attributes
Name | Data type | Occurs | Description
--- | --- | --- | ---
structure_type | CS | 1..1 | This will indicate the time and/or spatial organisation of the data within this CLUSTER. The code set for this attribute is defined in EN 13606-3:2008. The code value of this attribute is constrained by the LRA to being a member of the LraStructureType value set.
## Relationships
Name | Class | Occurs | Description
--- | --- | --- | ---
parts | ITEM | 0..* | This association permits a CLUSTER to contain other CLUSTERs and/or ELEMENTs.
## Constraints
Type | Name | Specification
--- | --- | ---
cluster structure type LRA vocab | LRA Invariant | --The value of attribute name.code.code is a member of the value set LraClusterStructureType. inv: structure_type.code.oclIsTypeOf(LraClusterStructureType)
meaning is undefined | LRA Invariant | --Attribute meaning is undefined (i.e. value assignment is prohibited) inv: meaning.oclIsUndefined()
name value | LRA Inv: Fixed | inv: name.value = <a href="$element://{99CDF407-1579-4eac-BB4F-F9D25CB6AA56}"><font color="#0000ff"><u>LraRecordComponentName</u></font></a>.CLUSTER