XPath axis, get all following nodes until


(//h2[. = 'Foo bar'])[1]/following-sibling::p
   [1 = count(preceding-sibling::h2[1] | (//h2[. = 'Foo bar'])[1])]

In case it is guaranteed that every h2 has a distinct value, this may be simplified to:

//h2[. = 'Foo bar']/following-sibling::p
   [1 = count(preceding-sibling::h2[1] | ../h2[. = 'Foo bar'])]

This means: Select all p elements that are following siblings of the h2 (first or only one in the document) whose string value is 'Foo bar' and also the first preceding sibling h2 for all these p elements is exactly the h2(first or only one in the document) whose string value is‘Foo bar’`.

Here we use a method of finding whether two nodes are identical:

count($n1 | $n2) = 1

is true() exactly when the nodes $n1 and $n2 are the same node.

This expression can be generalized:

       [1 = count(preceding-sibling::node()[name() = name($x)][1] | $x)]

selects all “immediate following siblings” of any node specified by $x.

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