# 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: EIVL
This is implemented as described in ISO 21090. ## Specializes ## QSET ## Attributes
Name | Data type | Occurs | Description
--- | --- | --- | ---
event | TimingEvent | 0..1 | This is implemented as described in ISO 21090.
offset | IVL_PQ | 0..1 | This is implemented as described in ISO 21090.
## Constraints
Type | Name | Specification
--- | --- | ---
no updateMode or History on EIVL attributes | Invariant | inv: noUpdateOrHistory(offset)
required attributes | Invariant | inv: isNotNull implies (event.oclIsDefined)