Re: [xsl] with XPath 1.0, select all following sibling elements of name "foo" up to the first non-"foo" element

["Wolfhart Totschnig wolfhart.totschnig@xxxxxxxxxxx" <xsl-list-service@xxxxxxxxxxxxxxxxxxxxxx>]

Dear Ken,

Thank you for the prompt reply! I cannot use the "intersect" operator 
because it is XPath 2.0, but your suggestion made me look into how I can 
get the intersection of two node sets with XPath 1.0, and so I found out 
that there is the so-called Kaysian method for that, namely:

B  $node_set_1[count(. | $node_set_2) = count($node_set_2)]

Hence, in my case the solution is:

B B  <xsl:variable name="node_set_1" select="following-sibling::foo"/>
B B  <xsl:variable name="node_set_2" 
select="following-sibling::*[not(self::foo)][1]/preceding-sibling::foo "/>
B B  <xsl:copy-of select="$node_set_1[count(. | $node_set_2) = 
count($node_set_2)]"/>

Thanks again!
Wolfhart


On 17-02-21 23:12, G. Ken Holman g.ken.holman@xxxxxxxxx wrote:
> Would something like the following work for you?
>
> B  following-sibling::foo intersect
> B  following-sibling::*[not(self::foo)][1]/preceding-sibling::foo
>
> . . . . . . . Ken
>
> At 2021-02-18 01:32 +0000, Wolfhart Totschnig 
> wolfhart.totschnig@xxxxxxxxxxx wrote:
> > Content-Transfer-Encoding: 8bit
> >
> > Dear list,
> >
> > I am facing an XPath problem for which I cannot find the solution. I 
> > want to select all following sibling elements of name "foo" up to the 
> > first non-"foo" element. So, in the following case, the first two 
> > <foo> elements should be selected:
> >
> > <foo/>
> > <foo/>
> > <bar/>
> > <foo/>
> >
> > In the following case, all three <foo> elements should be selected:
> >
> > <foo/>
> > <foo/>
> > <foo/>
> >
> > And in the following case, nothing should be selected:
> >
> > <bar/>
> > <foo/>
> > <foo/>
> >
> > I came up with the following non-working approach:
> >
> > B B B B B B B B B B B  <xsl:choose>
> > B B B B B B B B B B B B B B B  <xsl:when 
> > test="not(following-sibling::*[not(self::foo)])">
> > B B B B B B B B B B B B B B B B B B B  <xsl:value-of select="following-sibling::*"/>
> > B B B B B B B B B B B B B B B  </xsl:when>
> > B B B B B B B B B B B B B B B  <xsl:otherwise>
> > B B B B B B B B B B B B B B B B B B B  <xsl:value-of 
> > select="following-sibling::*[not(self::source)][1]/preceding-sibling::*[self::source][preceding-sibling::current()]"/>
> > B B B B B B B B B B B B B B B  </xsl:otherwise>
> > B B B B B B B B B B B  </xsl:choose>
> >
> > That is, test whether there are non-"foo" following siblings. If 
> > there are none, take all following siblings. If there are, go forward 
> > to the first non-"foo" sibling, and from there go backwards, taking 
> > all the "foo" siblings up to the current node.
> >
> > But this does not work. Apparently, the expression 
> > "preceding-sibling::current()" is not a valid construct. So what is 
> > the correct way to do what I have in mind (or a simpler solution, if 
> > there is one). Please note that this stylesheet needs to be executed 
> > by a web browser, and so the solution has to remain within XPath 1.0.
> >
> > Thanks in advance for your help!
> > Wolfhart
>
>
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