如何创建条件Xpath语句？

Question

我想选择带有条件Xpath的xml节点 -

xmlnode.SelectSingleNode("if (ns:substanceAdministration/ns:consumable/@typeCode == UNK) then evaluateThisXpath else evaluateOtherXpath")

我担心的是 -

<drugID code="UNK">
    <sub code="2232" />
</drugID>

如果父节点的@code是UNK,那么只有它应该取子节点的@code值,否则取父@code值.

Answer 1

fri*_*sco 8

这应该做的伎俩:

(drugID[@code='UNK']/sub)|(drugID[@code<>'UNK')

它是Xpath伪代码,将其更改为您的库语言

Answer 2

用途:

drugId[@code = 'UNK']/sub/@code | drugId/@code[not(. = 'UNK')]

可以"缩写":

(drugId[@code = 'UNK']/sub | drugId[not(@code = 'UNK')])/@code