Re: [xsl] xsl:accumulator and temporary trees

Subject: Re: [xsl] xsl:accumulator and temporary trees
From: "Martin Honnen martin.honnen@xxxxxx" <xsl-list-service@xxxxxxxxxxxxxxxxxxxxxx>
Date: Wed, 12 Feb 2020 14:08:17 -0000
Am 12.02.2020 um 15:01 schrieb Christophe Marchand cmarchand@xxxxxxxxxx:

I use an accumulator to calculate height of block elements in a page.

My accumulator is defined like this :

B  <xsl:accumulator name="height.counter" as="xs:double"
B B B  <xsl:accumulator-rule match="page" select="2.3"/>
B B B  <xsl:accumulator-rule match="li1" select="$value + 1.9"
B B B <xsl:accumulator-rule match="li2" select="$value + 1.8"
B B B  <xsl:accumulator-rule match="li3" select="$value + 1.34"
B B B  <xsl:accumulator-rule match="private:block" select="$value +
xs:double(./@height)" phase="end"/>
B  </xsl:accumulator>

Modes are defined like this :

B  <xsl:mode name="private:acc" on-no-match="shallow-skip"
B  <xsl:mode use-accumulators="#all"/>

For a special element, I calculate the block height, and I proceed
like this :

B B B  <xsl:variable name="block" as="element(private:block)">
B B B B B  <private:block height="{$height}"/>
B B B  </xsl:variable>
B B B  <xsl:apply-templates mode="private:acc" select="$block"/>

li1, li2 and li3, which are in source tree and processed in default
mode do modify accumulator value. But my accumulator is never
incremented when a private:block is processed.

Any suggestion will be much appreciated.

Accumulators, like keys, work on a tree, if you have some nodes in one tree and the temporarily created element that is obviously in a different tree then the accumulators of the temporarily created tree are computed independently of the input tree.

I think you need to push the input through a mode that adds the
private:block elements and then you need to push that complete,
temporarily created tree through a new mode where you want to use the

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