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Re: Re: Ignoring Duplicates In key()

Subject: Re: Re: Ignoring Duplicates In key()
From: "Bob Portnell" <simply.bobp@xxxxxxxxx>
Date: Tue, 10 Oct 2006 18:33:33 -0700
Re:  Re: Ignoring Duplicates In key()
Just to put paid to this thread, I did finally get a solution for my
problem. That solution involved creating a string to pass as the
recursive parameter rather than a node set. Then on each recursion I
could look at the value of a node, see if that was contain()ed in the
recursion parameter, and if it wasn't then add it to a placeholder
string. That placeholder would be concat()enated onto the recursion
parameter and away we'd go again.

Of course, XSLT2 would have been nicer. Oh, well.

Bob Portnell
simply.bobp@xxxxxxxxx

On 9/14/06, Bob Portnell <simply.bobp@xxxxxxxxx> wrote:
After much thrashing today, I'd come to much the same conclusions.
However! It looks like I can make the original recursive model work IF
I teach it NOT to put nodes with duplicated values into the set in the
first place. In other words, Recipe 7.2 in the XSLT Cookbook, or 9.2
in the XSLT Cookbook 2e. (looks) Erk.Well, I know what I'll be doing
tomorrow.

Thanks, everyone, for your patience with me taking up the bandwidth.

Bob Portnell
simply.bobp@xxxxxxxxx

On 9/14/06, Wendell Piez <wapiez@xxxxxxxxxxxxxxxx> wrote:
> 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',$group)">
> >             <xsl:sort select="."/>
> >             <xsl:if test="generate-id(.) =
> >generate-id(key('ComponentByValue',.)[1])">
> >
> >Still only generates ", gewgaw".
> >
> >Rats!
> >
> >Still here,
> >Bob Portnell
> >simply.bobp@xxxxxxxxx
> >
> >On 9/14/06, Bob Portnell <simply.bobp@xxxxxxxxx> wrote:
> >>Hmm. Okay, answer found:
> >>http://www.biglist.com/lists/xsl-list/archives/200006/msg00748.html
> >>
> >>Sorry for the distraction.
> >>BobP
> >>
> >>On 9/14/06, Bob Portnell <simply.bobp@xxxxxxxxx> wrote:
> >> > Here's some fun in XSLT 1.0, using variously the MSXML 3.0 or xsltproc
> >> > processors (result behaviors are the same).
> >> >
> >> > Here's some data...
> >> >
> >> >    <factor group="0" >
> >> >       <number>100</number>
> >> >       <components>
> >> >         <component>widget</component>
> >> >       </components>
> >> >     </factor>
> >> >     <factor group="1">
> >> >       <number>110</number>
> >> >        <components>
> >> >         <component>widget</component>
> >> >         <component>gewgaw</component>
> >> >       </components>
> >> >     </factor>
> >> >     <factor group="1">
> >> >       <number>112</number>
> >> >       <components>
> >> >         <component>gewgaw</component>
> >> >       </components>
> >> >     </factor>
> >> >
> >> > My need is to create a string of unique "components" in a "group". The
> >> > original XSLT for this relied on a recursion structure and wasn't
> >> > successfully blocking duplicates. My notion was to just wait for it to
> >> > finish all the recursion (for its other needs), and then hit it with a
> >> > key(), defined thus:
> >> >
> >> > (XSLT fragment)
> >> >
> >> > <xsl:key name="ComponentByGroup" match="component" use="../../@group" />
> >> >
> >> > (and then)
> >> >
> >> > <xsl:variable name="ComponentString">
> >> >     <xsl:for-each
> >> > select="key('ComponentByGroup',$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.bobp@xxxxxxxxx

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