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Re: double document merge using keys
Subject: Re: double document merge using keys
From: Michael Kay <mike@xxxxxxxxxxxx>
Date: Thu, 24 Jun 2010 16:14:50 +0100
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It would get horribly inefficient if you had millions of pages, but if
you only have a hundred or so, you can key the lesson on every page in
its range thus:
<xsl:key name="p" match="Chapterlesson" use="startNum to endNum"/>
You can then find the Chapterlessons that have some overlap with a given
range using
(for $p in $localStart to $localEnd return key('p', $p)) | ()
(The | () is to eliminate duplicates)
and then you can filter this to find those that are wholly within your
range rather than merely having some overlap.
However, on reflection, I think this is unlikely to perform any better
than a straight search of the data using a predicate.
If you really need a high-performance solution then some kind of
sort-merge-grouping process might be the answer - but it will be complex.
Michael Kay
Saxonica
On 24/06/2010 15:36, Terry Ofner wrote:
Is it possible to "key" on two values during a document merge? Let me explain.
I have document that includes lesson name and the page range of the lesson:
Writing with Power
Pages 512
Collaborating Through the Writing Process
Pages 1332
I have transformed the information into the following xml:
<chapter>
<Chapterlesson code="6.1.1">
<ch>1</ch>
<lesson>Writing with Power</lesson>
<startNum>5</startNum>
<endNum>12</endNum>
</Chapterlesson>
<Chapterlesson code="6.1.2">
<ch>1</ch>
<lesson>Collaborating Through the Writing Process</lesson>
<startNum>13</startNum>
<endNum>32</endNum>
</Chapterlesson>
...
</chapter>
I have a set of standards that need to be aligned with each lesson. The standards are coded to the page, not the lesson. Here is a snippet of the current xml of standardDoc.xml:
<standards>
<stand startNum="5" endNum="5">19.A.4</stand>
<stand startNum="11" endNum="11">14.D.2</stand>
<stand startNum="11" endNum="11">14.D.3</stand>
<stand startNum="13" endNum="14">14.A.2</stand>
<stand startNum="15" endNum="15">14.A.1</stand>
<stand startNum="16" endNum="16">14.A.1</stand>
....
</standards>
The following stylesheet works as far as it goes. It only captures the standards that match the start page of the lesson. What I need is way to address standards with startNum>= $localStart and<= $localEnd. Is there a way to do this using keys?
<?xml version="1.0" encoding="UTF-8"?>
<xsl:stylesheet xmlns:xsl="http://www.w3.org/1999/XSL/Transform" version="2.0">
<xsl:variable name="stand2page" select="document('stand2page.xml')"/>
<xsl:key name="standPage" match="stand" use="@startNum"/>
<xsl:template match="Chapterlesson">
<xsl:copy>
<xsl:copy-of select="@*"/>
<xsl:apply-templates/>
<xsl:variable name="localStart" select="startNum"/>
<xsl:variable name="localEnd" select="endNum"/>
<xsl:for-each select="$stand2page">
<stand><xsl:copy-of select="key('standPage', $localStart)"/></stand>
</xsl:for-each>
</xsl:copy>
</xsl:template>
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