# 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: PQV
The class PQV is a quantity class which provides an ability to maintain a longitudinal transformation history through the source attribute. ## Specializes ## QTY ## Attributes
Name | Data type | Occurs | Description
--- | --- | --- | ---
precision | Integer | 1..1 | This is implemented as described in ISO 21090.
source | PQV | 1..1 | This is implemented as described in ISO 21090.
value | Real | 1..1 | This is implemented as described in ISO 21090.
## Constraints
Type | Name | Specification
--- | --- | ---
no codingRationale in LRA | LRA Invariant | inv: codingRationale->isEmpty