Re: [xsl] for vs. for-each

["G. Ken Holman g.ken.holman@xxxxxxxxx" <xsl-list-service@xxxxxxxxxxxxxxxxxxxxxx>]

In:

    <xsl:sequence select="$values[.]"/>

... the context when opening the predicate is
$values and not the current item from the for-each.

In:

    <xsl:sequence select="$values[current()]"/>

... the context when opening the predicate begins
at $values but current() jumps the context back
to the beginning of the XPath expression, which
is the current item from the for-each.

So it is readily explained. And it isn't a
difference between for and for-each, it is that
your predicate value either uses the context of
the XPath node test (the ".") or ignores the
context of the node test (the $i and current()).

I hope this helps.

. . . . . Ken

At 2021-03-14 18:05 +0000, Michael MC<ller-Hillebrand mmh@xxxxxxxxx wrote:
> Folks,
>
> Given a variable with a sequence of values
>
> <xsl:variable name="values" select="(1,2,3,4,5)" as="xs:double+"/>
>
> these are three methods to report its content:
>
> <xsl:sequence select="for $i in 1 to count($values) return $values[$i]"/>
>
> <xsl:for-each select="1 to count($values)">
>     <xsl:sequence select="$values[.]"/>
> </xsl:for-each>
>
> <xsl:for-each select="1 to count($values)">
>     <xsl:sequence select="$values[current()]"/>
> </xsl:for-each>
>
> The first works as expected, the second does
> not, but the third astonishingly enough gives me
> the same result as the first. Check it out:
>
> https://xsltfiddle.liberty-development.net/ei5R4v8/2
>
> I read/understand that there is a difference
> between a for expression and a path expression,
> but since we can use atomized values in
> xsl:for-each, I would like to see more similarity between for and for-each.
>
> Should this be on the wishlist for XSLT 4 or do
> I have to learn/understand some more concepts?
>
> Puzzled greeting,
>
> - Michael


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