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An evaluation of regular path expressions with qualifiers against XML streams

机译:使用针对XML流的限定符评估正则路径表达式

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We present SPEX, a streamed and progressive evaluation of regular path expressions with XPath-like qualifiers against XML streams. SPEX proceeds as follows. An expression is translated in linear time into a network of transducers, most of them having 1-DPDT equivalents. Every stream message is then processed once by the entire network and result fragments are output on the fly. In most practical cases SPEX needs a time linear in the stream size and for transducer stacks a memory quadratic in the stream depth. Experiments with a prototype implementation point to a very good efficiency of the SPEX approach.
机译:我们介绍了SPEX,它是对XML数据流使用类似XPath的限定符对常规路径表达式进行流式处理和逐步评估的方法。 SPEX进行如下。将表达式以线性时间转换为转换器网络,其中大多数转换器具有1-DPDT等效项。然后,每个流消息都会被整个网络处理一次,并且结果片段会即时输出。在大多数实际情况下,SPEX需要流大小的时间线性,而对于换能器堆栈,流深度需要二次存储。使用原型实现的实验表明SPEX方法的效率很高。

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