Question

<time-layout time-coordinate="local" summarization="none">
      <layout-key>k-p24h-n7-1</layout-key>
      <start-valid-time>2013-10-30T08:00:00-07:00</start-valid-time>
      <end-valid-time>2013-10-30T20:00:00-07:00</end-valid-time>
      <start-valid-time>2013-10-31T08:00:00-07:00</start-valid-time>
      <end-valid-time>2013-10-31T20:00:00-07:00</end-valid-time>
      <start-valid-time>2013-11-01T08:00:00-07:00</start-valid-time>
      <end-valid-time>2013-11-01T20:00:00-07:00</end-valid-time>
      <start-valid-time>2013-11-02T08:00:00-07:00</start-valid-time>
      <end-valid-time>2013-11-02T20:00:00-07:00</end-valid-time>
      <start-valid-time>2013-11-03T07:00:00-08:00</start-valid-time>
      <end-valid-time>2013-11-03T19:00:00-08:00</end-valid-time>
      <start-valid-time>2013-11-04T07:00:00-08:00</start-valid-time>
      <end-valid-time>2013-11-04T19:00:00-08:00</end-valid-time>
      <start-valid-time>2013-11-05T07:00:00-08:00</start-valid-time>
      <end-valid-time>2013-11-05T19:00:00-08:00</end-valid-time>
    </time-layout>
    <time-layout time-coordinate="local" summarization="none">
      <layout-key>k-p24h-n6-2</layout-key>
      <start-valid-time>2013-10-30T20:00:00-07:00</start-valid-time>
      <end-valid-time>2013-10-31T09:00:00-07:00</end-valid-time>
      <start-valid-time>2013-10-31T20:00:00-07:00</start-valid-time>
      <end-valid-time>2013-11-01T09:00:00-07:00</end-valid-time>
      <start-valid-time>2013-11-01T20:00:00-07:00</start-valid-time>
      <end-valid-time>2013-11-02T09:00:00-07:00</end-valid-time>
      <start-valid-time>2013-11-02T19:00:00-07:00</start-valid-time>
      <end-valid-time>2013-11-03T08:00:00-08:00</end-valid-time>
      <start-valid-time>2013-11-03T19:00:00-08:00</start-valid-time>
      <end-valid-time>2013-11-04T08:00:00-08:00</end-valid-time>
      <start-valid-time>2013-11-04T19:00:00-08:00</start-valid-time>
      <end-valid-time>2013-11-05T08:00:00-08:00</end-valid-time>
    </time-layout>
    <time-layout time-coordinate="local" summarization="none">
      <layout-key>k-p3h-n35-3</layout-key>
      <start-valid-time>2013-10-30T11:00:00-07:00</start-valid-time>
      <start-valid-time>2013-10-30T14:00:00-07:00</start-valid-time>
      <start-valid-time>2013-10-30T17:00:00-07:00</start-valid-time>
      <start-valid-time>2013-10-30T20:00:00-07:00</start-valid-time>
      <start-valid-time>2013-10-30T23:00:00-07:00</start-valid-time>
      <start-valid-time>2013-10-31T02:00:00-07:00</start-valid-time>
      <start-valid-time>2013-10-31T05:00:00-07:00</start-valid-time>
      <start-valid-time>2013-10-31T08:00:00-07:00</start-valid-time>
      <start-valid-time>2013-10-31T11:00:00-07:00</start-valid-time>
      <start-valid-time>2013-10-31T14:00:00-07:00</start-valid-time>
      <start-valid-time>2013-10-31T17:00:00-07:00</start-valid-time>
      <start-valid-time>2013-10-31T20:00:00-07:00</start-valid-time>
      <start-valid-time>2013-10-31T23:00:00-07:00</start-valid-time>
      <start-valid-time>2013-11-01T02:00:00-07:00</start-valid-time>
      <start-valid-time>2013-11-01T05:00:00-07:00</start-valid-time>
      <start-valid-time>2013-11-01T08:00:00-07:00</start-valid-time>
      <start-valid-time>2013-11-01T11:00:00-07:00</start-valid-time>
      <start-valid-time>2013-11-01T14:00:00-07:00</start-valid-time>
      <start-valid-time>2013-11-01T17:00:00-07:00</start-valid-time>
      <start-valid-time>2013-11-01T23:00:00-07:00</start-valid-time>
      <start-valid-time>2013-11-02T05:00:00-07:00</start-valid-time>
      <start-valid-time>2013-11-02T11:00:00-07:00</start-valid-time>
      <start-valid-time>2013-11-02T17:00:00-07:00</start-valid-time>
      <start-valid-time>2013-11-02T23:00:00-07:00</start-valid-time>
      <start-valid-time>2013-11-03T04:00:00-08:00</start-valid-time>
      <start-valid-time>2013-11-03T10:00:00-08:00</start-valid-time>
      <start-valid-time>2013-11-03T16:00:00-08:00</start-valid-time>
      <start-valid-time>2013-11-03T22:00:00-08:00</start-valid-time>
      <start-valid-time>2013-11-04T04:00:00-08:00</start-valid-time>
      <start-valid-time>2013-11-04T10:00:00-08:00</start-valid-time>
      <start-valid-time>2013-11-04T16:00:00-08:00</start-valid-time>
      <start-valid-time>2013-11-04T22:00:00-08:00</start-valid-time>
      <start-valid-time>2013-11-05T04:00:00-08:00</start-valid-time>
      <start-valid-time>2013-11-05T10:00:00-08:00</start-valid-time>
      <start-valid-time>2013-11-05T16:00:00-08:00</start-valid-time>
    </time-layout>

目前我正在使用Java中的XPath解析XML。一切都很好，直到我看到这三个街区。让我感到困惑的是，我遇到了三个<time-layout time-coordinate="local" summarization="none">，每个都有不同类型的信息。我目前的“黑客”是将每个local重命名为local1，local2和local3，因此我通过/dwml/data/time-layout[@time-coordinate='local3']/start-valid-time/text()解析XPath。这是一种黑客行为，但由于我将很快直接从提取此XML的网站上读取XML，我不想使用这种方式，或者也许，我不能使用该黑客。由于那里有三个类似命名的元素，如何只用XPath解析第三个元素，而不重命名其中一个属性？

谢谢！

P.S。 <layout-key>值每次都不同，因此我无法将其硬编码到我的解析器中。

Answer 1

那么你可以检查你的xpath谓词中是否存在<end-valid-time>，如果它不存在，你就会看第3个元素。

//time-layout[not(./end-valid-time)]

这也是一个黑客攻击，但至少它只是在xpath中。

Answer 2

使用谓词：

//time-layout[3]

使用XPath解析相同的XML元素

2 个答案: