Subject: Re: [xsl] XPath expression that yields the same result as xsl:for-each-group? From: "Martin Honnen martin.honnen@xxxxxx" <xsl-list-service@xxxxxxxxxxxxxxxxxxxxxx> Date: Thu, 30 May 2019 13:06:40 -0000 |
Hello XSLT/XPath experts!and TRM__IDENT.
My XML document consists of a series of rows.
Each row is identified by the combination of two child elements: ARPT__IDENT
ARPT__IDENT and TRM__IDENT.
I want to group the rows. A group consists of those rows with the same
'|', TRM__IDENT)">
This XML document:
<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>
is to be grouped this way:
<results> <group> <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> </group> <group> <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> </group> </results>
I can use xsl:for-each-group to perform the grouping:
<xsl:template match="Test"> <xsl:variable name="rows" select="row" as="element(row)*"/> <results> <xsl:for-each-group select="$rows" group-by="concat(ARPT__IDENT,
and then iterate over the variable:<group> <xsl:sequence select="current-group()" /> </group> </xsl:for-each-group> </results> </xsl:template>
However, I want to create a variable -- $groups -- which holds the groups
<results> <xsl:for-each select="$groups"> <group> <xsl:sequence select="." /> </group> </xsl:for-each> </results>
What XPath expression will yield the desired value for $groups?
<xsl:variable name="groups" select="???" />
Is there an XPath 2.0 expression that can be used?
What kind of sequence type would you expect that XPath expression to return? You can't build sequences of sequences to somehow wrap the items belonging to a group.
So unless you could move to XPath 3.1 with maps and/or arrays I don't see an XPath type constructed with pure XPath to hold groups. And of course even there it would be easier and smarter to use XSLT to create the map or the nested sequence/array or array/sequence structure than to rely on pure XPath I think.
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