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// 从classpath中获取
InputStream inputStream = getClass().getClassLoader().getResourceAsStream("chapter6/dynamic-form/leave.bpmn");

// 创建转换对象
BpmnXMLConverter converter = new BpmnXMLConverter();

// 创建XMLStreamReader读取XML资源
XMLInputFactory factory = XMLInputFactory.newInstance();
XMLStreamReader reader = factory.createXMLStreamReader(inputStream);

// 把XML转换成BpmnModel对象
BpmnModel bpmnModel = converter.convertToBpmnModel(reader);

// 验证BpmnModel对象不为空
assertNotNull(bpmnModel);
Process process = bpmnModel.getMainProcess();
Collection<FlowElement> flowElements = process.getFlowElements();
for (FlowElement flowElement : flowElements) {
    System.out.println(flowElement);
}