# 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: ConstrainedDomainModelRelationship
A semantic relationship between two Constrained Domain Model class instances. ## Specializes ## AnyDomainModelRelationship ## Attributes
Name | Data type | Occurs | Description
--- | --- | --- | ---
lower | Integer | 1..1 | The minimum allowable number of instances of an instance of this class.
upper | UnlimitedNatural | 1..1 | The maximum allowable number of instances of an instance of this class.
## Constraints
Type | Name | Specification
--- | --- | ---
Instance is a specialisation of one and only one DomainModelRelationship instance. | LRA Invariant | inv: self.generalization-&gt;size() = 1 and self.generalization-&gt;exists(c: Class | c.oclIsTypeOf(DomainModelRelationship)
## Reference Model Type ##