[XSL-LIST Mailing List Archive Home] [By Thread] [By Date] [Recent Entries] [Reply To This Message] Re: Each value in an XPath array is a sequence of ele
$first_group is an array of nodes. To turn it into a sequence of nodes, use "?*". So it's ($first_group?*)/row (parentheses because I don't have the operator precedences in my head) Michael Kay Saxonica > On 6 Jun 2019, at 15:26, Costello, Roger L. costello@xxxxxxxxx <xsl-list-service@xxxxxxxxxxxxxxxxxxxxxx> wrote: > > 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. > > <Test> > <row> > <ARPT__IDENT>A</ARPT__IDENT> > <TRM__IDENT>X</TRM__IDENT> > <Data>Foo</Data> > </row> > <row> > <ARPT__IDENT>A</ARPT__IDENT> > <TRM__IDENT>X</TRM__IDENT> > <Data>Bar</Data> > </row> > <row> > <ARPT__IDENT>A</ARPT__IDENT> > <TRM__IDENT>Y</TRM__IDENT> > <Data>Blah</Data> > </row> > <row> > <ARPT__IDENT>A</ARPT__IDENT> > <TRM__IDENT>Y</TRM__IDENT> > <Data>Plugh</Data> > </row> > </Test> > > 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)) > return > for $i in $keys > return > array {$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 expression: > > <xsl:variable name="Foo-row-first-group" select="$first-group/row[Data eq 'Foo']"/> > > Apparently it is not the appropriate XPath expression, because I get this error message: > > Axis step child::element(Q{}row) cannot > be used here: the context item is not a node > > What is the appropriate XPath expression, please? > > /Roger
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