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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如果发生此错误的原因不十分明显，请仔细检查查询，并跟踪从数据源到错误发生点的每个子句的结果的类型。

If it is not immediately obvious why the error is occurring, examine the query carefully and trace the type of the result of each clause from the data source to the point where the error is occurring.

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对数据源直接执行查询，此查询将返回类型化结果的序列。

Executes a query directly against the data source and returns a sequence of typed results.

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