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[xsl] Each value in an XPath array is a sequence of elements ... how to access a particular element in a particular array value?

2019-06-06 09:25:56
Hi Folks,

This is an extension to a question that I had last week ...

Recall that I want to group the <row> elements in the following XML. Each group 
should consist of those <row> elements that have the same ARPT__IDENT, 
TRM__IDENT values.


That XML consists of two groups. Each group has two <row> elements.

Martin provided a great XPath 3.1 expression for doing the grouping:

<xsl:variable name="groups" as="array(element(row))*" select="
    let $keys := 
        distinct-values($rows/concat(ARPT__IDENT, '|', TRM__IDENT))
        for $i in $keys
            array {$rows[$i = concat(ARPT__IDENT, '|', TRM__IDENT)] }           

In the following, I select the first group:

<xsl:variable name="first-group" select="$groups[1]" />

Next, I want to select the <row> element in the first group that has Foo as the 
value of the <Data> element. I thought that this would be the appropriate XPath 

<xsl:variable name="Foo-row-first-group" select="$first-group/row[Data eq 

Apparently it is not the appropriate XPath expression, because I get this error 

        Axis step child::element(Q{}row) cannot
        be used here: the context item is not a node

What is the appropriate XPath expression, please?

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