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Re: [Accumulators] Another stupid question

Subject: Re: [Accumulators] Another stupid question
From: "Martin Honnen martin.honnen@xxxxxx" <xsl-list-service@xxxxxxxxxxxxxxxxxxxxxx>
Date: Tue, 6 Oct 2020 22:50:39 -0000
Re:  [Accumulators] Another stupid question
On 07.10.2020 00:33, Michael Kay mike@xxxxxxxxxxxx wrote:

Your private:block element is matched by a different "accumulator
instance" from the one that matches the page element; an accumulator
instance corresponds to one document, and accumulator instances for
different documents don't interact. Otherwise, there would be a terrible
dependency on order of processing.

Saxon evaluates unstreamed accumulators lazily: the first time you
evaluate accumulator-before, or accumulator-after, on any node in a
particular document, the accumulator values are computed for all nodes
in that document.

Now I wonder whether nevertheless the sample shows that the accumulator wrongly did not fire for the parentless element.

A shorter test case is

<?xml version="1.0" encoding="UTF-8"?> <xsl:stylesheet xmlns:xsl="http://www.w3.org/1999/XSL/Transform" xmlns:xs="http://www.w3.org/2001/XMLSchema" exclude-result-prefixes="#all" version="3.0">

  <xsl:accumulator name="a1" as="xs:string" initial-value="'init'">
      <xsl:accumulator-rule match="foo" select="$value || ', matched '
|| path()"/>

  <xsl:param name="p1">

  <xsl:param name="p2" as="element(foo)">

  <xsl:template name="xsl:initial-template">
      <xsl:apply-templates select="$p1/node(), $p2"/>

  <xsl:template match="foo">
      <foo-processed accumulator-value="{accumulator-before('a1')}"


when run with Saxon 10.2 HE with option -it it outputs

<?xml version="1.0" encoding="UTF-8"?><foo-processed
accumulator-value="init, matched /Q{}foo[1]" root=""/><foo-processed
accumulator-value="init" root="foo"/>

Shouldn't the rule for `foo` elements be applied as well to the
parentless `foo` and therefore it should have an accumulator-before
value different from the "init" initial value?

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