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[xsl] Grouping but not starting at the first element.

Subject: [xsl] Grouping but not starting at the first element.
From: "Kerry, Richard" <richard.kerry@xxxxxxxx>
Date: Tue, 2 Oct 2012 15:58:11 +0000

I have a problem involving groups.  With the advice of the List a few weeks
ago I managed to make a lot of progress on solving a problem by using XSLT
groups.  I'm now back on the issue and have a supplementary problem I need to

My input XML is shown below.  It represents part of an Excel spreadsheet,
hence the references to rows and columns.

<row row="1">
<column column="1" cell="A1">DDF</column>
<column column="2" cell="B1">AT3G_UP_DN</column>
<row row="2">
<column column="1" cell="A2">id</column>
<column column="2" cell="B2">name</column>
<column column="3" cell="C2">type</column>
<column column="4" cell="D2">class</column>
<column column="5" cell="E2">caption</column>
<column column="6" cell="F2">value</column>
<row row="3">
<column column="1" cell="A3">1</column>
<column column="2" cell="B3">Card fail</column>
<column column="3" cell="C3">integer</column>
<column column="4" cell="D3">enum</column>
<row row="4">
<column column="1" cell="A4"></column>
<column column="2" cell="B4"></column>
<column column="3" cell="C4"></column>
<column column="4" cell="D4"></column>
<column column="5" cell="E4">Card Fail</column>
<column column="6" cell="F4">0</column>
<row row="5">
<column column="1" cell="A5"></column>
<column column="2" cell="B5"></column>
<column column="3" cell="C5"></column>
<column column="4" cell="D5"></column>
<column column="5" cell="E5">Card OK</column>
<column column="6" cell="F5">1</column>
<row row="6">
<column column="1" cell="A6">2</column>
<column column="2" cell="B6">SD-SD ARC bypass</column>
<column column="3" cell="C6">integer</column>
<column column="4" cell="D6">enum</column>
<row row="7">
<column column="1" cell="A7"></column>
<column column="2" cell="B7"></column>
<column column="3" cell="C7"></column>
<column column="4" cell="D7"></column>
<column column="5" cell="E7">Normal</column>
<column column="6" cell="F7">0</column>
<row row="8">
<column column="1" cell="A8"></column>
<column column="2" cell="B8"></column>
<column column="3" cell="C8"></column>
<column column="4" cell="D8"></column>
<column column="5" cell="E8">Bypass</column>
<column column="6" cell="F8">1</column>

Rows 1 and 2 are headings.
The subsequent rows are in groups.
Row 3 (with columns 1 to 4) starts a group.  This will generate an "item"
Rows 4 and 5 have columns 5 and 6, and end up as "sub-item" elements which are
children of the most recent "item".
The same relationship holds between row 6 and its children in rows 7 and 8.
ie 6 should generate an "item" and 7 and 8 "sub-item" children.

My stylesheet looks like this :

<?xml version="1.0" encoding="UTF-8"?>
<xsl:stylesheet version="2.0"
<xsl:output method="xml" indent="yes" />
<xsl:template match="sheet">
<xsl:for-each-group select="row" group-starting-with="row[column[1][. != '']]"
<item name="{column[2]}" row="{@row}" >
<xsl:apply-templates select="current-group()" mode="col-1">
<!-- row process. Called on row within group. -->
<xsl:template match="row" mode="col-1" >
<xsl:if test="normalize-space(column[5])" >
<sub-item caption="{column[5]}" value="{column[6]}" />

So I'm grouping based on starting with rows with column[1] not empty.

The result I get is :
<?xml version="1.0" encoding="UTF-8"?>
<item name="AT3G_UP_DN" row="1"/>
<item name="name" row="2">
<sub-item caption="caption" value="value"/>
<item name="Card fail" row="3">
<sub-item caption="Card Fail" value="0"/>
<sub-item caption="Card OK" value="1"/>
<item name="SD-SD ARC bypass" row="6">
<sub-item caption="Normal" value="0"/>
<sub-item caption="Bypass" value="1"/>

I understand why I get this.  What I'd like to do is get rid of the items
generated by rows 1 and 2.
These rows represent headings or control information and don't want to get
into the result.

The logic would appear to be something like group-starting-with
row[column[1][. != '']] except for rows 1 and 2.
If this was not using groups I'd just set up a couple of no output templates
for row[1] and row[2], but I'm using a template matching on "sheet" and
scanning the rows using groups so I can't do that (can I ?).

Can anyone advise how to go about achieving this ?  Do I need to add something
to the group spec ?  Do I need to add another template to swallow the unwanted
rows, and if so how, given that the rows are being processed in groups ?


Richard Kerry
BNCS Engineer
T: +44 (0)20 82259063
M: +44 (0)7812 325518
Room EBX 301, BBC Television Centre, Wood Lane, London, W12 7RJ

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