Re: [xsl] Find First Descendants That Match Predicate?

["David Carlisle d.p.carlisle@xxxxxxxxx" <xsl-list-service@xxxxxxxxxxxxxxxxxxxxxx>]

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