XPath 1.0查找元素的值是否在值列表中 [英] XPath 1.0 to find if an element's value is in a list of values

问题描述

有没有办法构建一个XPath来评估元素的值是否在预定义的值列表中？类似于此：

  / Location / Addr [State ='TX或AL或MA'] 
  

哪些会与德州，阿拉巴马州或马萨诸塞州的州元素匹配？我知道我可以解压缩表达式：

  / Location / Addr [State ='TX] or / Location / Addr [State ='AL']等... 
  

但是这是有点麻烦，因为xpaths是相当的长的，值的列表。我的google-fu在这个问题上没有太大的变化...

解决方案

你可以检查同一个方块内的多个条件括号：

  / Location / Addr [State ='TX'或State ='AL'或State ='MA'] 
  

或者如果您有一个很长的列表，您可以创建一个状态列表，并使用 contains（） function。

  / Location / Addr [contains（'TX AL MA '，州）] 
  

这对两个字母的状态缩写可以正常工作。如果你想使更长的字符串更健壮，你可以在末尾添加一些空格，并检查 _TX _ ， _AL _ 等（下划线为空格）。

  / Location / Addr [contains（'TX AL MA'，concat （''，州，'））] 
  




Is there a way to construct an XPath that evaluates whether an element's value is in a predefined list of values? Something akin to this:

/Location/Addr[State='TX or AL or MA']

Which would match nodes whith State elements for Texas, Alabama, or Massachusetts? I know that I can unpack the expression:

/Location/Addr[State='TX] or  /Location/Addr[State='AL'], etc...

But this is a bit cumbersome since the xpaths are quite long, as is the list of values. My google-fu isn't turning up much on the issue...

解决方案

You can check multiple conditions inside the same square brackets:

/Location/Addr[State='TX' or State='AL' or State='MA']

Or if you have a really long list, you can create a list of states and use the contains() function.

/Location/Addr[contains('TX AL MA', State)]

This will work fine for two-letter state abbreviations. If you want to make it more robust for longer strings you could add some spaces on the ends and check for _TX_, _AL_, etc. (where the underscores are spaces).

/Location/Addr[contains(' TX AL MA ', concat(' ', State, ' '))]

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