saxon:evaluate() is always going to be expensive. In situations where you
are using the same expression repeatedly (e.g. to calculate a sort key or a
grouping key) it's well worth splitting it into its two halves,
saxon:expression and saxon:eval:
<xsl:variable name="sortkey"
select="saxon:expression(../data-set/order-by/@xpath)"/>
then
<xsl:sort select="saxon:eval($sortkey)"/>
Michael Kay
http://www.saxonica.com/
-----Original Message-----
From: Angela Williams
[mailto:Angela(_dot_)Williams(_at_)the401kcompany(_dot_)com]
Sent: 07 March 2007 15:19
To: xsl-list(_at_)lists(_dot_)mulberrytech(_dot_)com
Subject: RE: [xsl] for-each-group usage
That was it - thanks!
Is this stylesheet efficient or is there a better way of doing this?
-----Original Message-----
From: Michael Kay [mailto:mike(_at_)saxonica(_dot_)com]
Sent: Tuesday, March 06, 2007 5:47 PM
To: xsl-list(_at_)lists(_dot_)mulberrytech(_dot_)com
Subject: RE: [xsl] for-each-group usage
The group-by and order-by expressions both need to be
relative to the nodes being grouped. That is, you want the
group-by expression to be "d"
rather
than "doc('one.xml')/a/b/d" You seem to have fixed this for
the sort key (by using substring-after), but not for the grouping key.
Michael Kay
http://www.saxonica.com/
-----Original Message-----
From: Angela Williams
[mailto:Angela(_dot_)Williams(_at_)the401kcompany(_dot_)com]
Sent: 06 March 2007 22:33
To: xsl-list(_at_)lists(_dot_)mulberrytech(_dot_)com
Subject: [xsl] for-each-group usage
Hello!
I have a mistake in my XSLT 2.0 stylesheet below that is
causing the
grouping mechanism to not work properly. I've used for-each-group
successfully in the past, but this is more complicated (or
I am just
making it more so).
Will someone please point out my error?
Also, is there a more elegant/efficient way of going about this?
I have two xml files. One.xml contains my data objects and two.xml
defines a list of table columns and tells me which data to put in
which column. I need to match on my table columns and
inject the data
at run time.
Desired output:
Seed Pod
Apple E
Orange E
Root
Potato E
Carrot E
Actual output:
Seed Pod
Apple E
Potato E
Orange E
Carrot E
Root
Apple E
Potato E
Orange E
Carrot E
One.xml:
<a>
<b>
<c>Apple</c>
<d>Seed Pod</d>
<e> E </e>
</b>
<b>
<c>Potato</c>
<d>Root</d>
<e> E </e>
</b>
<b>
<c>Orange</c>
<d>Seed Pod</d>
<e> E </e>
</b>
<b>
<c>Carrot</c>
<d>Root</d>
<e> E </e>
</b>
</a>
Two.xml:
<table>
<data-set>
<row-set xpath="doc('one.xml')/a/b"/>
<group-by xpath="doc('one.xml')/a/b/d"/>
<order-by xpath="doc('one.xml')/a/b/c"/>
</data-set>
<columns>
<column>
<data-value xpath="doc('one.xml')/a/b/c"/>
</column>
<column>
<data-value xpath="doc('one.xml')/a/b/e"/>
</column>
</columns>
</table>
And my stylesheet (included in a master file - I can send that if
needed.):
<xsl:stylesheet xmlns:fo="http://www.w3.org/1999/XSL/Format";
xmlns:xs="http://www.w3.org/2001/XMLSchema";
xmlns:xsl="http://www.w3.org/1999/XSL/Transform";
xmlns:sax="http://saxon.sf.net/"; version="2.0">
<xsl:template match="columns">
<xsl:variable name="cols" select="." />
<xsl:variable name="rows" as="xs:string">
<xsl:value-of select="../data-set/row-set/@xpath" />
</xsl:variable>
<xsl:variable name="group" as="xs:string">
<xsl:value-of select="../data-set/group-by/@xpath" />
</xsl:variable>
<xsl:variable name="sort" as="xs:string">
<xsl:value-of select="../data-set/order-by/@xpath" />
</xsl:variable>
<xsl:for-each-group select="sax:evaluate($rows)"
group-by="sax:evaluate($group)">
<xsl:sort select="sax:evaluate(
substring-after($sort, concat($rows, '/'))
)" />
<fo:table-row>
<fo:table-cell>
<fo:block>
<xsl:value-of select="current-grouping-key()" />
</fo:block>
</fo:table-cell>
</fo:table-row>
<xsl:for-each select="current-group()">
<xsl:variable name="node" select="." />
<fo:table-row>
<xsl:for-each select="$cols/column">
<fo:table-cell column-number="{position()}">
<fo:block>
<xsl:variable name="field">
<xsl:value-of select="data-value/@xpath" />
</xsl:variable>
<xsl:value-of
select="$node/sax:evaluate(
substring-after($field, concat($rows,
'/'))
)" />
</fo:block>
</fo:table-cell>
</xsl:for-each>
</fo:table-row>
</xsl:for-each>
</xsl:for-each-group>
</xsl:template>
</xsl:stylesheet>
Thanks!
Angela Williams
Angela(_dot_)Williams(_at_)the401kcompany(_dot_)com
Austin, TX
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