@ParametersAreNonnullByDefault
| Interface | Description | 
|---|---|
| RelationService | 
 Relation service, which allows to manage relations between entities. 
 | 
| RelationService.RelatableFinder<R extends Relatable> | 
 Finder, which is used to perform basic relation operations, such as fetching source or target entities of
 particular relation, get total number of related entities etc. 
 | 
| RelationService.Validator | 
 Responsible for validating the create and delete operations that can be performed using the RelationService 
 | 
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