A Viewer can select a service and view some basic information for a selected service, such as version, business owner, and description.

查看者可以选择一项服务并查看所选服务的一些基本信息，如版本、业务所有者和描述。

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For the service of interest to the Viewer, the Viewer can choose to subscribe to the service, as shown in Figure 4.

对于查看者感兴趣的服务，查看者可以选择订阅该服务，如图4中所示。

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After the Viewer approves the cost, a Contract concept (between the service Provider and the Viewer) is created in the service registry.

查看者批准该成本后，将在服务注册中心创建契约(在服务提供者与查看者之间)。

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Until now, the viewer tracking service has only measured those tuning in for programming.

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Better still, it can receive NetChannel a Web-enhanced television service that can be personalised for each viewer.

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