This requires a fixed mapping from the expected XML structure to a collection of relational tables in your database schema.

这需要从预期的XML结构到数据库模式中的关系表集合的固定映射。

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While mapping an author element to an author instance isn't too bad, there's not grouping element, like authors, that makes it clear that each author belongs to a single collection in a Book instance.

尽管把一个author元素映射到一个author实例没什么问题，但是没有分组元素，比如authors，它清楚地显示出所有作者属于Book实例中的一个集合。

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XPathQueryService: Allows you to use XPath to query a collection or resource, including methods for namespace mapping and for query execution.

XPathQueryService：允许使用 XPath 查询集合或资源，包括用于名称空间映射和查询执行的方法。

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