Re: Find First Descendants That Match Predicate?

Thanks--setting the $here variable was the trick I was failing to see.

Cheers,

E.

--
Eliot Kimber
http://contrext.com


o;?On 12/24/18, 3:31 PM, "David Carlisle d.p.carlisle@xxxxxxxxx"
<xsl-list-service@xxxxxxxxxxxxxxxxxxxxxx> wrote:

    given

    <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>


    (I moved /chapter to the end?)

    and

    <xsl:stylesheet version="3.0"
xmlns:xsl="http://www.w3.org/1999/XSL/Transform">


     <xsl:template match="chapter">

     <xsl:message select="
    let $here:=. return
    .//section[empty(ancestor::*[title] except
    $here/ancestor-or-self::*[title])]/title
    "/>

     </xsl:template>

    </xsl:stylesheet>


    the xpath in the message produces

    <title>S1</title><title>S2</title>

    David

    On Mon, 24 Dec 2018 at 21:13, Graydon graydon@xxxxxxxxx
    <xsl-list-service@xxxxxxxxxxxxxxxxxxxxxx> wrote:
    >
    > 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