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How I select everything (all possible nodes) between the 1st and second h2? There can be n nodes between them, and there can be m h2 tags.
The nodes aren't necessarily going to be contained in an HTML elment, so the selector can just grab them all.
<html>
<h2>asdf</h2>
<p>good stuff 1</p>
<p>good stuff 2</p>
<p>good <a href="#">asdf</a>stuff n...</p>
<h2>qwer</h2>
<p>test2</p>
<h2>dfgh</h2>
<p>test2</p>
</html>
I'm just getting my feet wet with XPath. Please help my newbie question :)
Thanks so much!
758
One XPath expression that selects the wanted elements is:
/*/h2[1]
/following-sibling::p
[count(. | /*/h2[2]/preceding-sibling::p)
=
count(/*/h2[2]/preceding-sibling::p)
]
In general, in such cases one can use the Kayessian formula for set intersection:
$ns1[count(.|$ns2) = count($ns2)]
This XPath expression selects all the nodes that belong both to the nodesets $ns1 and $ns2.
If you want to get all nodes between two given nodes $n1 and $n2, this is the intersection of two nodesets: $n1/following-sibling::node() and $n2/preceding-sibling::node().
Just substitute these expression into the Kayessian formula and you have the wanted XPath expression.
In XPath 2.0, of course, one would use the << or >> operator, something like:
/*/h2[1]/following-sibling::p[. << /*/h2[1]/]
Not sure about xpath, but you have a tag C# 4.0 so the following code does the job:
XElement.Parse(xml)
.Element("h2")
.ElementsAfterSelf()
.TakeWhile(n => n.Name != "h2")
.ToList()
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