来自 xpath 查询的子集? [英] Subset from xpath query?

问题描述

我有大致如下的 XML:

I have XML that looks roughly as follows:

<Dispatch ID = "JJJJ">
    <Log ID = "150504BCFSP00072">
        <LogTime>"May  4 2015  5:48PM"</LogTime>
        <LogType>"1125-KKKK"</LogType>
        <LogDetails>
            <details>
                <DetailTime>"May  4 2015  5:48PM"</DetailTime>
                <IncidentDetail>"[1] The Thing I Want"</IncidentDetail>
                 <DetailTime>"May  4 2015  5:49PM"</DetailTime> 
                <IncidentDetail>"[2] The Thing I Don't Want"</IncidentDetail>
            </details>
         </LogDetails>
    </Log>
</Dispatch>

我想从站点 ID 为 JJJJ 的日志中提取所有 IncidentDetail 文本，&其中，它的 LogType 包含KKKK"，它的 IncidentDetail 以 [1] 开头(使其成为可能很多的第一个更新).到目前为止，我有这个 XPATH 查询:

I want to extract all IncidentDetail text from the log where the Station ID is JJJJ, & where its LogType contains "KKKK", and its IncidentDetail starts with [1] (making it the first update of potentially many). So far I have this XPATH query:

//Dispatch[@ID='JJJJ']//Log/LogType[contains(.,'KKKK')]

这会为我提供事件列表，如下所示:

This gets me a list of incidents, as follows:

Element='<LogType>"1125-KKKK"</LogType>'
Element='<LogType>"1125-KKKK"</LogType>'
Element='<LogType>"1125-KKKK"</LogType>'

但这只会让我陷入困境.我现在如何返回并获取与我要查找的内容相匹配的每个 LogType 事件的 IncidentDetail 文本?是否有一些多步骤的过程?

But that's only got me in a rathole. How do I go backward now and get the IncidentDetail text for each of these LogType incidents that match what I'm looking for? Is there some multi-step process?

感谢任何帮助.

推荐答案

你可以把它作为谓词，像这样:

Instead of stepping to Log/LogType in the main axis, you can put it as predicate like this :

//Dispatch[@ID='JJJJ'][Log/LogType[contains(.,'KKKK')]]

或其他方式:

//Dispatch[@ID='JJJJ' and Log/LogType[contains(.,'KKKK')]]

从这里开始，您可以轻松地继续主轴到达IncidentDetail，而无需任何后退:

From here, you can easily continue the main axis to get to IncidentDetail without having to go backward whatsoever :

/Log/LogDetails/details/IncidentDetail

关于更新:

您可以使用 xpath 索引添加过滤器以仅获取同一父级中的第一个 IncindentDetail :

You can add filter to get only the first IncindentDetail within the same parent either by using xpath index :

/Log/LogDetails/details/IncidentDetail[1]

或按节点的文本内容过滤:

or filtering by the node's text content :

/Log/LogDetails/details/IncidentDetail[contains(.,'[1]')

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