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It is also possible to access the DMN model instance by the decision definition id using the Repository Service, as the following incomplete test sample code shows: 
public void testRepositoryService() {
  String decisionDefinitionId = repositoryService.createDecisionDefinitionQuery()
    .decisionDefinitionKey(DECISION_KEY).singleResult().getId();
  DmnModelInstance modelInstance = repositoryService
    .getDmnModelInstance(decisionDefinitionId);
}