可能的原因是业务需求或特性功能发生了变化，因此也要求更改数据库架构。

There might be changes in business requirements or feature functionality that require changes to the database schema as well.

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我们在开始时提到的优点之一是，可以使用数据库功能搜索业务数据。

One of the advantages we discussed at the beginning is the ability to leverage database functionality to search for business data.

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注意：我们对此情景的假设是业务数据已经是xml格式的，尽管数据库可能没有任何XML功能。

Note: an assumption we are making for this scenario is that the business data is already in XML, even if the database might not have any XML capabilities.

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