code: public static DmnDecisionTableResult evaluate(String decisionKey, VariableContext variables) {
  //		ProcessEngineImpl processEngine = Context.getProcessEngineConfiguration().getProcessEngine();
  		// Do it "the internal way" to be able to use VariableContext directly
  		final DmnEngine dmnEngine = Context.getProcessEngineConfiguration().getDmnEngine();
  		DeploymentCache deploymentCache = Context.getProcessEngineConfiguration().getDeploymentCache();
  		DmnDecision decisionDefinition = (DmnDecision) deploymentCache.findDeployedLatestDecisionDefinitionByKey(decisionKey);
  		LOG.info("Evaluate chained decision: {} ", decisionDefinition);
  		return dmnEngine.evaluateDecisionTable(decisionDefinition, variables);
  	}
docs: ${evaluateDecision(decisionKey, variableContext).getFirstResult().get(resultVariableName)}