Just eyeballing this, Dmitry, I'm not convinced
it would work if Wolfhart was sitting at a <foo>
at the time he made his request, in which case
the <foo> he was at would incorrectly be included.

Granted the original requirement is
underspecified in this regard, so perhaps my
observation is irrelevant. I'm not trying to
nit-pick but I discounted the use of keys because
of the arbitrary starting point for evaluation.

Also the use= needs a "[1]" predicate to ensure
the correct cardinality for generate-id() in the
general case where there are multiple following siblings that are not <foo>.

I'm usually successful with keys when not having
to deal with the current context.

Here is a short and efficient XSLT 1.0 solution using keys:

<xsl:stylesheet version="1.0"
xmlns:xsl="<http://www.w3.org/1999/XSL/Transform>http://www.w3.org/1999/XSL/

B <xsl:output omit-xml-declaration="yes" indent="yes"/>
B <xsl:key name="kPrecedingFoo" match="foo"
use="generate-id(following-sibling::*[not(self::foo)])"/>
B
B  <xsl:template match="/*/*[1]">
B  B  <xsl:copy-of select="key('kPrecedingFoo',
generate-id(../*[not(self::foo)][1]))"/>
B  </xsl:template>
</xsl:stylesheet>

Applying this transformation on variations of
the following XML document (try uncommenting
different subsets of the commented elements) produces always the wanted

<t>
B  <!-- <bar/> -->
B  <foo ind="1"/>
B  <foo ind="2"/>
B  <!-- <bar/> -->
B  <foo ind="3"/>
</t>

Cheers,
Dimitre

On Wed, Feb 17, 2021 at 5:32 PM Wolfhart
Totschnig
<mailto:wolfhart.totschnig@xxxxxxxxxxx>wolfhart.totschnig@xxxxxxxxxxx
<<mailto:xsl-list-service@xxxxxxxxxxxxxxxxxxxxxx>xsl-list-service@xxxxxxxxxx

wrote:
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  <xsl:choose>
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  <xsl:value-of select="following-sibling::*"/>
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  <xsl:otherwise>
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

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  </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

--
Cheers,
Dimitre Novatchev
---------------------------------------
Truly great madness cannot be achieved without significant intelligence.
---------------------------------------
To invent, you need a good imagination and a pile of junk
-------------------------------------
Never fight an inanimate object
-------------------------------------
To avoid situations in which you might make mistakes may be the
biggest mistake of all
------------------------------------
Quality means doing it right when no one is looking.
-------------------------------------
You've achieved success in your field when you
don't know whether what you're doing is work or play
-------------------------------------
To achieve the impossible dream, try going to sleep.
-------------------------------------
Facts do not cease to exist because they are ignored.
-------------------------------------
Typing monkeys will write all Shakespeare's
works in 200yrs.Will they write all patents, too? :)
-------------------------------------
Sanity is madness put to good use.
-------------------------------------
I finally figured out the only reason to be alive is to enjoy it.
B
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