# 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: REAL
In ISO 21090 this value is used to represent real unitless numbers, that are not expressions of ratio (see RTO). It is not used to represent physical quantities with units, for which subtypes of the PQV datatype (itself a specialisation of QTY) is used. This is unchanged in the LRA ## Specializes ## QTY ## Attributes
Name | Data type | Occurs | Description
--- | --- | --- | ---
value | Real | 0..1 | This is implemented as described in ISO 21090.
precision | Integer | 0..1 | This is implemented as described in ISO 21090.
## Constraints
Type | Name | Specification
--- | --- | ---
null or value | Invariant | inv: isNull xor value.oclIsDefined