Hi Karl,
At 04:16 PM 5/3/2005, you wrote:
A challenge, group the following XML into 2 periods.
Okay, I'll bite.
(Anyone else answering this challenge, read no further till you're done!)
I'm assuming your target periods are known at time of writing. (If only
known at run-time, they can be parameterized. If not even that, more
specification is called for.) I'm also assuming your data is known to be
valid to the assumptions made for sorting (for example, there's no B whose
beginning is in one period and end is in another) -- there's no
exception-handling for any of that.
Here goes:
<?xml version="1.0" encoding="UTF-8"?>
<xsl:stylesheet version="1.0"
xmlns:xsl="http://www.w3.org/1999/XSL/Transform"
xmlns:local="data:hey-david"
exclude-result-prefixes="local">
<xsl:output indent="yes"/>
<xsl:variable name="period-groups" xmlns="data:hey-david">
<group start="1" end="12"/>
<group start="14" end="30"/>
</xsl:variable>
<xsl:variable name="periods" select="//*[(_at_)period_begin]"/>
<xsl:template match="/">
<result>
<xsl:apply-templates select="document('')/*/*/local:group"/>
</result>
</xsl:template>
<xsl:template match="local:group">
<xsl:variable name="start" select="@start"/>
<xsl:variable name="end" select="@end"/>
<period begins="{(_at_)start}" ends="{(_at_)end}">
<xsl:for-each
select="$periods[(_at_)period_begin >= $start and @period_end <=
$end]">
<xsl:sort select="@period_begin"/>
<xsl:sort select="@period_end"/>
<xsl:copy-of select="."/>
</xsl:for-each>
</period>
</xsl:template>
</xsl:stylesheet>
Run on the input you provided, this gets you the output you say you want.
Cheers,
Wendell
The periods are
arbitrary, but for this example they happen to be:
Period 1: 1 - 12
Period 2: 14 - 30
Expected Result:
<result>
<period begins="1" ends="12">
<B period_begin="1" period_end="5"/>
<B period_begin="2" period_end="7"/>
<B period_begin="3" period_end="10"/>
<B period_begin="4" period_end="12"/>
</period>
<period begins="14" ends="30">
<B period_begin="14" period_end="16"/>
<B period_begin="16" period_end="20"/>
<B period_begin="16" period_end="30"/>
</period>
</result>
Source XML / Result (sorted)
<A>
<B period_begin="1" period_end="5"/>
<B period_begin="2" period_end="7"/>
<B period_begin="3" period_end="10"/>
<B period_begin="4" period_end="12"/>
<B period_begin="14" period_end="16"/>
<B period_begin="16" period_end="20"/>
<B period_begin="16" period_end="30"/>
</A>
Source XML / Result (un-sorted)
<A>
<B period_begin="14" period_end="16"/>
<B period_begin="2" period_end="7"/>
<B period_begin="16" period_end="20"/>
<B period_begin="1" period_end="5"/>
<B period_begin="4" period_end="12"/>
<B period_begin="16" period_end="30"/>
<B period_begin="3" period_end="10"/>
</A>
======================================================================
Wendell Piez
mailto:wapiez(_at_)mulberrytech(_dot_)com
Mulberry Technologies, Inc. http://www.mulberrytech.com
17 West Jefferson Street Direct Phone: 301/315-9635
Suite 207 Phone: 301/315-9631
Rockville, MD 20850 Fax: 301/315-8285
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Mulberry Technologies: A Consultancy Specializing in SGML and XML
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