字段和属性被作为数据契约的一部分，依赖于转换器的实现。

The fields and properties included as part of that data contract is dependent on the implementation of the converter.

youdao

而后种情况里，则实现了可变性的扩展，仅仅允许用户选择行业标准内的数据契约规范。

In the later case, it would extend this point of variability, and only allow the user to select an industry standard data contract schema.

youdao

它不适合更复杂场景，理由很明显，数据契约太松散，它无法确保两层之间的键值对不出现错误的匹配。

The reason it doesn't scale to more complex scenarios is fairly obvious, the data contract is too loose and it becomes hard to ensure there are no mismatches in key, value pairs between the two tiers.

youdao