Re: [xsl] test for ancestral attribute returning variant results

On Sun, Oct 24, 2021 at 05:42:38PM -0000, Trevor Nicholls 
trevor(_at_)castingthevoid(_dot_)com scripsit:
[why is this test of version attributes afflicting me?]

I am not going to claim I fully understand the logic you've presented,
but I think you've got three cases:

1. the context item doesn't have an @version
2. the context item has an @version which does NOT differ by value from the 
first ancestor @version attribute
3. the context item has an @version which differs by value from the first 
ancestral @version attribute

In which case, I don't think you want:

<xsl:variable name="ancv" select=ancestor::*[@version][1]" />

I think you'd want something like (just typed! here! not in oXygen!)

<!-- I would reflexively do this on attributes but I think you want the
element context for page position -->
<xsl:variable name="versions" as="element()+" 
select="ancestor-or-self::*[normalize-space(@version)])" />

<xsl:choose>
    <xsl:when test="not(self::*[normalize-space(@version)]">
        <!-- the context item doesn't have a version;
        the context item's closest ancestral version is $versions[1] -->
    </xsl:when>
    <xsl:when test="$versions[1]/@version eq $versions[2]/@version">
        <!-- the context item version matches the closest ancestor version -->
    </xsl:when>
    <xsl:when test="$versions[1]/@version ne $versions[2]/@version">
        <!-- the context item version is different from the closest ancestor 
version
        -->
    </xsl:when>
    <xsl:otherwise>
        <xsl:message>Something completely unexpected has happened</xsl:message>
    </xsl:otherwise>
</xsl:choose>

Is that somewhere in the vague vicinity?

-- 
Graydon Saunders  | graydonish(_at_)gmail(_dot_)com
Þæs oferéode, ðisses swá mæg.
-- Deor  ("That passed, so may this.")
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