# 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: PopulationQuery
This class defines interfaces to query methods that provide for the specification of a direct query, a derived operation or a direct inference on all or a subset of the EHRs of a population of patients or service users accessible to the shareable EHR system. ## Specializes ## AbstractQuery ## Attributes
Name | Data type | Occurs | Description
--- | --- | --- | ---
persist_result | Boolean | 1..1 | True if the result of the query must be persisted, otherwise false.