Re: Find First Descendants That Match Predicate?

On Mon, Dec 24, 2018 at 08:57:40PM -0000, Eliot Kimber ekimber@xxxxxxxxxxxx scripsit:
> Using XPath 3:
[snip]
> Given a starting node, e.g., the root node (but could be any node in the hierarchy) I need to find the first titled "child" nodes, so given the chapter node  I need to find S1 and S2 but not S3.

If you meant:

<root>
    <chapter><title>C1</title>
    <wrapper>
        <wrapper>
            <section><title>S1</title>
            </section>
        </wrapper>
        <section><title>S2</title>
            <section><title>S3</title>
            </section>
        </section>
    </wrapper>
    </chapter>
</root>

then
//descendant::*[self::section][title][not(ancestor::*[self::section][title])]

will give you the first titled element of the type you're looking for.

You'll need to put the actual values for "foo" and "bar" in where there's a predicate for [self::section]; [self:foo or self::bar]

-- Graydon