The heterogeneous nature of XML data conflicts with the SQL assumption that every expression inside a query returns an array of rows and columns.
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。
These systems are heterogeneous, running different software packages across a wide array of hardware inside of a conventional facility.
这些系统是异构的，各种软件包运行在各种各样的常规硬件上。
These systems are heterogeneous, running different software packages across a wide array of hardware inside of a conventional facility.
这些系统是异构的，各种软件包运行在各种各样的常规硬件上。
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