On the right side of the diagram are the middleware applications and connectors to back-end services such as the Video on Demand (VOD) server, the Electronic Program Guide (EPG) provider, and so on.

在关系图的右侧是中间件应用程序以及到后端服务的连接器，此类后端服务包括视频点播(VOD)服务器、电子节目指南(EPG)提供程序等。

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