服务的语义描述的用途在于，可帮助服务请求程序在调用服务前理解服务的内容、范围、要求、输出和效果。
The purpose of the semantic description of the service is to help the service requester to understand the content, scope, requirements, outcomes and effects before the service is invoked.
右下方的窗格显示服务的输出 — 运行应用程序的机器的日期／时间。
The lower-right pane displays the output of the service -- the date/time of the machine on which the application is running.
简单来说，插件不过是一个可以作为安装设置输出的现有应用程序或服务，其随后可以从一个远程存储库中安装到您的机器中。
Simply put, a plug-in is nothing more than an existing application or service that is exported as an install setup, which can then be installed on your machine from a remote repository.
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