public void SetRelation(IClassifiable relatable, IClassifiable related, RelationDirection direction = RelationDirection.Undefined, TaxonomyNode type = null)
{
foreach (var relEntity in relationRepo.GetRelated(relatable, direction, type == null ? null : type.entity))
{
relationRepo.Delete(relEntity);
}
RelateInternal(relatable, related, direction, type);
}