Bob,
The simple solution would just be
<xsl:template match="factor">
<xsl:for-each
select="components/component[not(.=preceding-sibling::component)]">
<xsl:value-of select="."> ... etc ...
But maybe you're looking at more than that? This won't work if the
components you wish to deduplicate aren't siblings of one another.
Nor is the preceding:: axis much help, if you're trying to use keys.
Because you want to punctuate your deduplicated list, a more general
solution hits up against the limitations of the one-pass limitation
in XSLT 1.0. (This is because your collection of the deduplicated
nodes has to occur within a single XPath if you want to punctuate it
properly.) This means in 1.0 you're probably going to have to use a
compound key (key the components to a concatenation of their value
with a generated id for their group ancestor) and deduplicate from that set.
Or, if using 2.0, grouping constructs can be used to deduplicate:
<xsl:template match="factor">
<xsl:for-each-group select=".//component" group-by=".">
<xsl:value-of select="current-group()[1]"/>
<!-- or use current-grouping-key() -->
<xsl:if test="not(position()=last())">, </xsl:if>
</xsl:for-each>
</xsl:template>
XSLT 2.0 makes this kind of thing much easier.
Or, in 1.0, do two passes....
Cheers,
Wendell
At 02:46 PM 9/14/2006, you wrote:
Whoops, spoke too soon. That gives a similar result when applied to
the original XSLT. More specifically, creating a new key
<xsl:key name="ComponentByValue" match="component" use="." />
<xsl:for-each select="key('ComponentByGroup',$group)">
<xsl:sort select="."/>
<xsl:if test="generate-id(.) =
generate-id(key('ComponentByValue',.)[1])">
Still only generates ", gewgaw".
Rats!
Still here,
Bob Portnell
simply(_dot_)bobp(_at_)gmail(_dot_)com
On 9/14/06, Bob Portnell <simply(_dot_)bobp(_at_)gmail(_dot_)com> wrote:
Hmm. Okay, answer found:
http://www.biglist.com/lists/xsl-list/archives/200006/msg00748.html
Sorry for the distraction.
BobP
On 9/14/06, Bob Portnell <simply(_dot_)bobp(_at_)gmail(_dot_)com> wrote:
> Here's some fun in XSLT 1.0, using variously the MSXML 3.0 or xsltproc
> processors (result behaviors are the same).
>
> Here's some data...
>
> <factor group="0" >
> <number>100</number>
> <components>
> <component>widget</component>
> </components>
> </factor>
> <factor group="1">
> <number>110</number>
> <components>
> <component>widget</component>
> <component>gewgaw</component>
> </components>
> </factor>
> <factor group="1">
> <number>112</number>
> <components>
> <component>gewgaw</component>
> </components>
> </factor>
>
> My need is to create a string of unique "components" in a "group". The
> original XSLT for this relied on a recursion structure and wasn't
> successfully blocking duplicates. My notion was to just wait for it to
> finish all the recursion (for its other needs), and then hit it with a
> key(), defined thus:
>
> (XSLT fragment)
>
> <xsl:key name="ComponentByGroup" match="component" use="../../@group" />
>
> (and then)
>
> <xsl:variable name="ComponentString">
> <xsl:for-each
> select="key('ComponentByGroup',$group)[not(.=preceding::component)]">
> <xsl:sort select="."/>
> <xsl:if test="position() > 1">
> <xsl:text>, </xsl:text>
> </xsl:if>
> <xsl:value-of select="." />
> </xsl:for-each>
> </xsl:variable>
>
> The desired output would be "gewgaw, widget", but for some reason I'm
> getting only "widget." When applied to more complex data, in one case
> where 12 items should be displayed, it's correctly stopping the
> duplicates but also making two singletons vanish.
>
> The [not(.=preceding::component)] is the basic structure I found for
> reducing duplicates, but it doesn't seem to play quite nicely with the
> key() ... it's reducing too many!
>
> Thoughts welcome.
>
> Bob Portnell
> simply(_dot_)bobp(_at_)gmail(_dot_)com
>
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