Re: [xsl] Sibling axis: All of kind A up to first of kind B

[Michael Ludwig <mlu@xxxxxxxxxxxxx>]

Michael Kay schrieb:
> > The other day, "sibling recursion" was mentioned on this list.
> > Does the following qualify as sibling recursion - and is this
> > likely to be more efficient for large input?
> >
> >        <xsl:apply-templates mode="toc"
> >          select="(following-sibling::h1 |
> > following-sibling::h2)[ 1 ]"/>
>
> Might be safer to do following-sibling::*[self::h1 or self::h2][1] -
> but depends on the processor.

Why might this be safer? Aren't the resulting node-sets the same and
the expressions therefore equivalent? Doesn't the union operator impose
document order?

Michael Ludwig