Bruce (and group),
I am still trying to find a stopping point but before it got too late
I thought it best to showcase a quick sample of how you would go about
solving this problem using the sample XML you provided. I will
convert this into the proper namespaces and elements and check it in
as soon as I can finish up this other item.
The XML I used was:
<?xml version="1.0" encoding="UTF-8"?>
<list>
<item author="five" year="2001"/>
<item author="three" year="2003"/>
<item author="four" year="2002"/>
<item author="two" year="1998"/>
<item author="one" year="2005"/>
<item author="two" year="2000"/>
<item author="four" year="1999"/>
</list>
Which I then processed with the following XSLT 2.0-based stylesheet:
<?xml version="1.0" encoding="UTF-8"?>
<xsl:stylesheet xmlns:xsl="http://www.w3.org/1999/XSL/Transform" version="2.0">
<xsl:output method="xml" indent="yes"/>
<xsl:template match="/">
<author>
<xsl:apply-templates select="list"/>
</author>
</xsl:template>
<xsl:template match="list">
<xsl:for-each-group select="item" group-by="@author">
<author-group author="{(_at_)author}">
<xsl:apply-templates select="current-group()">
<xsl:sort select="@author"/>
<xsl:sort select="@year"/>
</xsl:apply-templates>
</author-group>
</xsl:for-each-group>
</xsl:template>
<xsl:template match="item">
<item>
<xsl:choose>
<xsl:when test="position() = 1">
<xsl:apply-templates select="@author"/>
<xsl:apply-templates select="@year"
mode="standard-year-output"/>
</xsl:when>
<xsl:otherwise>
<xsl:apply-templates select="@year"
mode="shorten-year-output"/>
</xsl:otherwise>
</xsl:choose>
</item>
</xsl:template>
<xsl:template match="@author">
<xsl:attribute name="year">
<xsl:value-of select="."/>
</xsl:attribute>
</xsl:template>
<xsl:template match="@year" mode="standard-year-output">
<xsl:attribute name="year">
<xsl:value-of select="."/>
</xsl:attribute>
</xsl:template>
<xsl:template match="@year" mode="shorten-year-output">
<xsl:attribute name="year">
<xsl:value-of select="substring(., 3)"/>
</xsl:attribute>
</xsl:template>
</xsl:stylesheet>
When processed the following is the result output:
<?xml version="1.0" encoding="UTF-8"?>
<author>
<author-group author="five">
<item year="2001"/>
</author-group>
<author-group author="three">
<item year="2003"/>
</author-group>
<author-group author="four">
<item year="1999"/>
<item year="02"/>
</author-group>
<author-group author="two">
<item year="1998"/>
<item year="00"/>
</author-group>
<author-group author="one">
<item year="2005"/>
</author-group>
</author>
A couple things to note:
- The output could have just as easily have been text. But to
showcase where each author group starts and stops as well as the years
contained within each group I felt this would be easier to understand
for someone looking at this without any backround.
- If XML was the format I would need this to be in at this stage of
the transformation I would have probably held of from stripping the
date to its 2 digit shorthand... of course now that I said that I
realized I should have processed the date output using one of the many
great additions to the 2.0 spec, date processing :) This will still
work fine of course and if I had more time I would change it right now
but for now I think its safe to leave it as is
:)
- actually there was one other point but for the life of me I cant
remember what it was. If it comes to me and it seems important enough
to post I will do just that.
As I mentioned earlier I am finishing a few things on some other
projects but as soon as I am done with the new and improved version of
the projects stylesheet for this item I will check it in and ping you
to let you know. If you need this before late afternoon you may want
to try to use the above as a guide to recreate the logic for that
stylesheet and if you get into a jam, ping me and I will see if I can
rearrange things a bit.
If any of the rest of you have comments, questions or concerns please,
by all mean :D
On 4/22/05, Bruce D'Arcus <bdarcus(_at_)gmail(_dot_)com> wrote:
I'm having some problems with grouping and position().
For illustration, you could imagine an input source like:
<list>
<item author="five" year="2001"/>
<item author="three" year="2003"/>
<item author="four" year="2002"/>
<item author="two" year="1998"/>
<item author="one" year="2005"/>
<item author="two" year="2000"/>
<item author="four" year="1999"/>
</list>
I need to group and sort by author, then by year, and then pass some
parameters that are based on the item's position within -- in this case
-- the author group.
I have this template:
<xsl:template match="mods:modsCollection" mode="sort_author-year">
<xsl:variable name="bibref" select="mods:mods" />
<xsl:for-each-group select="$bibref" group-by="bib:grouping-key(.)">
<xsl:sort select="current-grouping-key()"/>
<xsl:variable name="author-position" select="position()"/>
<xsl:variable name="shorten-author" as="xs:boolean"
select="$author-position > 1" />
<xsl:for-each-group select="current-group()"
group-by="bib:year(.)">
<xsl:sort select="current-grouping-key()" />
<xsl:variable name="year">
<xsl:value-of select="current-grouping-key()"/>
<xsl:if test="last() > 1">
<xsl:number value="position()" format="a"/>
</xsl:if>
</xsl:variable>
<xsl:for-each select="current-group()">
<xsl:apply-templates select="mods:titleInfo">
<xsl:with-param name="year" select="$year"/>
<xsl:with-param name="shorten-author"
select="$shorten-author"/>
</xsl:apply-templates>
</xsl:for-each>
</xsl:for-each-group>
</xsl:for-each-group>
</xsl:template>
The bib:grouping-key function constructs an author names string to sort.
The problem is the author-position variable.
What I want is for it to measure position within an author group. But
I'm getting these sorts of results:
AUTHOR POSITION: 1
SHORTEN: false
AUTHOR POSITION: 2
SHORTEN: true
AUTHOR POSITION: 2
SHORTEN: true
AUTHOR POSITION: 3
SHORTEN: true
AUTHOR POSITION: 4
SHORTEN: true
AUTHOR POSITION: 4
SHORTEN: true
AUTHOR POSITION: 5
SHORTEN: true
AUTHOR POSITION: 6
... which tells me it's measuring the position of the group itself.
What I'm wanting is:
AUTHOR POSITION: 1
SHORTEN: false
AUTHOR POSITION: 1
SHORTEN: false
AUTHOR POSITION: 2
SHORTEN: true
AUTHOR POSITION: 1
SHORTEN: false
AUTHOR POSITION: 1
SHORTEN: false
AUTHOR POSITION: 2
SHORTEN: true
AUTHOR POSITION: 1
SHORTEN: false
AUTHOR POSITION: 1
SHORTEN: false
How do I fix this?
Bruce
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