如何知道所使用的提供者支持哪些属性呢？
How do you know what properties are supported by your provider?
合同涵盖了服务惯例的所有属性以及提供者和请求者如何对其进行使用，它的订立为计量服务的使用建立了基础。
The contract lays the foundation for metering the services to be used, by covering all the attributes of the service customs and how they shall be employed by provider and requestor.
可以在这里配置提供者特有的属性。
In there, properties specific for that provider instance can be configured.
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