XAPI covers storage, retrieval, modification, and querying of data in an XML database, with support for transaction management.
XAPI 涵盖了 XML 数据库中数据的存储、检索、修改和查询，以及对事务管理的支持。
Important functions in this module are connecting to a database, querying the database, and giving out results of the query.
该模块中的重要函数有：连接数据库的函数、查询数据库的函数以及提供查询结果的函数。
The index is created by querying the database for the list of unique categories and brands for all the products in the database.
索引通过查询数据库中所有产品的惟一种类和品牌的列表而创建。
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