每个事件的负载是两个小部件之间的数据接口。
The payload of each event is a data interface between the two widgets.
为了有足够的小部件来实现Mashup的组装，需要有可用性较广的数据服务接口来让小部件表示。
For there to be a sufficient number of widgets available to make the assembly of mashups a reality, there needs to be a widespread availability of data service interfaces for the widgets to represent.
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