在实现活动对象模型时涉及到的最重要处理程序类型是提供程序处理程序。

The most important type of handler involved in implementing the active object model is the provider handler.

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这些类型的活动会出现在更高层的建模中，比如在模型查询对象所组成的元数据Business View中，而不是数据源查询对象。

Those types of activities can take place at a higher level of modeling, such as in a Business View of the metadata comprised of model query subjects rather than data source query subjects.

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