SQL假设查询内的每一个表达式都返回一个行和列的数组，而XML数据的异构本质与之相冲突。
The heterogeneous nature of XML data conflicts with the SQL assumption that every expression inside a query returns an array of rows and columns.
在大多数组织中，处理异构系统是一个常见主题，但在维护企业目录时，不同的系统可能会成为问题。
Working with disparate systems is a common theme in most organizations, but different systems can be problematic when you're maintaining enterprise directories.
在大多数组织中，处理异构系统是一个常见主题，但在维护企业目录时，不同的系统可能会成为问题。
Working with disparate systems is a common theme in most organizations, but different systems can be problematic when you're maintaining enterprise directories.
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