dataOutputExpression.setValue(outputDataItem);
BpmnModelUtil.addExtensionElement(dataOutput, FixFlowPackage.Literals.RESOURCE_FILTER__EXPRESSION, dataOutputExpression);
newLoopCharacteristics.setOutputDataItem(dataOutput);
//输入变量
DataInput dataInput = Bpmn2Factory.eINSTANCE.createDataInput();
Expression dataInputExpression = FixFlowFactory.eINSTANCE.createExpression();
dataInputExpression.setName(inputDataItem);
dataInputExpression.setValue(inputDataItem);
BpmnModelUtil.addExtensionElement(dataInput, FixFlowPackage.Literals.RESOURCE_FILTER__EXPRESSION, dataInputExpression);
newLoopCharacteristics.setInputDataItem(dataInput);