而当用户进一步希望索引某些目录的子目录树而非其它时，文档列表就能变得精确而无遗漏。
While one might still want to index some directory sub-trees, but not others, the list of documents can be exhaustive and precise.
通过SIAPI，您还可以浏览与集合关联的目录树，并显示属于特定目录的文档。
With SIAPI, you can also browse category trees associated with collections and display the documents that belong to a specific category.
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