XML query evaluation: Execution plans and new operators.
XML查询计算：执行计划和新操作符。
Once the data is stored in the database as XML, the data can be queried very efficiently, as the XML is not parsed at runtime for query evaluation.
在数据库中以xml格式存储数据之后，可以非常高效地查询该数据，因为在运行时无需执行XML解析来实现查询计算。
XSIEQ(XML stream query with immediate evaluation), a kind of XML stream query system, can evaluate predicates immediately and output in time.
介绍了一种立即计算谓词并即时输出的XML流数据查询系统XSIEQ。
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