Although ontology defines a service as a subclass of element, it states that instances of higher level classes, for example, systems may provide capabilities that can be offered as services.
尽管在本体中服务是作为元素的子类而定义的，但是它也提到，上层类别(如系统)的实例提供的能力也可视为服务。
RequestEvent, a subclass of JTCEvent, is used to represent a lightweight transaction or single-step service request.
RequestEvent是JTCEvent的子类，用来表示一个轻量级事务或单步服务请求。
A service is implemented as a subclass of service and you can learn more about it in the Services developer guide.
一个service是Service类的子类，阅读Services开发指导你能了解到更多。
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