Re: [xsl] Excluding an element with specific content from an <xsl:sort> call

["Imsieke, Gerrit, le-tex" <gerrit.imsieke@xxxxxxxxx>]

Hi Mark,

I think if you only want to sort elements where no two items share the 
same 'hash' (i.e., concatenated property values), Ken's solution is 
perfect. This is because each item will be in a group of its own, and 
these single-element groups will be properly sorted according to the 
given criteria.

But if you really want to *group* equivalent items as in the following 
ficticious output example, I think you'll have to consider nested 
for-each-groups.

<catalog name="cat1">
  <prefixGroup prefix="NilOrA">
    <item catalogNumber="34">
      ...
    </item>
    <item catalogNumber="36">
      ...
    </item>
  </prefixGroup>
  <prefixGroup prefix="B">
    <item catalogNumber="24">
      ...
    </item>
  </prefixGroup>
</catalog>
...

Gerrit

On 30.01.2010 22:51, Mark Wilson wrote:
> Hi Gerrit,
> A very good comment, but in this instance the for-each-group coding does
> what I need it to. However, I will make a note of your advise in case
> circumstances change.
> Mark
>
> --------------------------------------------------
> From: "Imsieke, Gerrit, le-tex" <gerrit.imsieke@xxxxxxxxx>
> Sent: Saturday, January 30, 2010 1:42 PM
> To: <xsl-list@xxxxxxxxxxxxxxxxxxxxxx>
> Subject: Re: [xsl] Excluding an element with specific content from an
> <xsl:sort> call
>
> > Another idea why Mark wasn't satisfied with the suggested solution:
> >
> > Maybe he intended to have a nested for-each-group instead of
> > concatenated group-by arguments. If he selects the concatenated
> > strings as group-by keys, he will have strings like
> >
> > 'fooAbar' 'fooCbar' 'foobar'
> >
> > But then 'fooAbar' isn't equivalent with 'foobar' (with an empty
> > prefix instead of 'A' between the other strings 'foo' and 'bar'), as
> > he expected. The items with prefix 'A' will be in another group than
> > the items without prefix.
> >
> > Therefore he should probably group by CatalogName first, then inside
> > each group by Prefix (thereby treating 'A' and '' as equivalent as you
> > suggested), then by the other tie-breakers.
> >
> > Gerrit
> >
> >
> >
> > On 30.01.2010 22:23, G. Ken Holman wrote:
> > > At 2010-01-30 13:05 -0800, Mark Wilson wrote:
> > > > Thanks Ken,
> > > > But it did not work.
> > >
> > > My bad ... in my haste I neglected to think of the behaviour triggered
> > > in the "if" statement when the Prefix element is absent. When an operand
> > > of the comparison operator is the empty set, the comparison returns
> > > false.
> > >
> > > It worked for me when I turned the expression inside out:
> > >
> > > <xsl:sort select="if( Prefix!='A' ) then Prefix else ''"/>
> > >
> > > Now the same '' value is used for sorting if the prefix is 'A' (the test
> > > calculates as false) or the prefix is absent (the test defaults as
> > > false).
> > >
> > > I hope the illustration below helps. Note how document order is
> > > maintained for all records that have no prefix or the prefix is 'A',
> > > thus proving they are being sorted with the same value.
> > >
> > > . . . . . . . . . . . Ken
> > >
> > > T:\ftemp>type mark.xml
> > > <tests>
> > > <record>
> > > <order>1</order>
> > > <Prefix>D</Prefix>
> > > </record>
> > > <record>
> > > <order>2</order>
> > > <Prefix>A</Prefix>
> > > </record>
> > > <record>
> > > <order>3</order>
> > > <Prefix>L</Prefix>
> > > </record>
> > > <record>
> > > <order>4</order>
> > > <Prefix>A</Prefix>
> > > </record>
> > > <record>
> > > <order>5</order>
> > > </record>
> > > <record>
> > > <order>6</order>
> > > <Prefix>A</Prefix>
> > > </record>
> > > <record>
> > > <order>7</order>
> > > </record>
> > > <record>
> > > <order>8</order>
> > > <Prefix>L</Prefix>
> > > </record>
> > > <record>
> > > <order>9</order>
> > > <Prefix>D</Prefix>
> > > </record>
> > > </tests>
> > >
> > > T:\ftemp>call xslt2 mark.xml mark.xsl
> > > <?xml version="1.0" encoding="UTF-8"?>
> > > <tests>
> > > <record>
> > > <order>2</order>
> > > <Prefix>A</Prefix>
> > > </record>
> > > <record>
> > > <order>4</order>
> > > <Prefix>A</Prefix>
> > > </record>
> > > <record>
> > > <order>5</order>
> > > </record>
> > > <record>
> > > <order>6</order>
> > > <Prefix>A</Prefix>
> > > </record>
> > > <record>
> > > <order>7</order>
> > > </record>
> > > <record>
> > > <order>1</order>
> > > <Prefix>D</Prefix>
> > > </record>
> > > <record>
> > > <order>9</order>
> > > <Prefix>D</Prefix>
> > > </record>
> > > <record>
> > > <order>3</order>
> > > <Prefix>L</Prefix>
> > > </record>
> > > <record>
> > > <order>8</order>
> > > <Prefix>L</Prefix>
> > > </record>
> > > </tests>
> > > T:\ftemp>type mark.xsl
> > > <?xml version="1.0" encoding="US-ASCII"?>
> > > <xsl:stylesheet xmlns:xsl="http://www.w3.org/1999/XSL/Transform";
> > > version="2.0">
> > >
> > > <xsl:output indent="yes"/>
> > >
> > > <xsl:template match="tests">
> > > <xsl:copy>
> > > <xsl:for-each select="record">
> > > <xsl:sort select="if( Prefix!='A' ) then Prefix else ''"/>
> > > <xsl:copy-of select="."/>
> > > </xsl:for-each>
> > > </xsl:copy>
> > > </xsl:template>
> > >
> > > </xsl:stylesheet>
> > >
> > > T:\ftemp>rem Done!
> > >
> > >
> > >
> > > --
> > > UBL and Code List training: Copenhagen, Denmark 2010-02-08/10
> > > XSLT/XQuery/XPath training after http://XMLPrague.cz 2010-03-15/19
> > > XSLT/XQuery/XPath training: San Carlos, California 2010-04-26/30
> > > Vote for your XML training: http://www.CraneSoftwrights.com/s/i/
> > > Crane Softwrights Ltd. http://www.CraneSoftwrights.com/s/
> > > Training tools: Comprehensive interactive XSLT/XPath 1.0/2.0 video
> > > Video lesson: http://www.youtube.com/watch?v=PrNjJCh7Ppg&fmt=18
> > > Video overview: http://www.youtube.com/watch?v=VTiodiij6gE&fmt=18
> > > G. Ken Holman mailto:gkholman@xxxxxxxxxxxxxxxxxxxx
> > > Male Cancer Awareness Nov'07 http://www.CraneSoftwrights.com/s/bc
> > > Legal business disclaimers: http://www.CraneSoftwrights.com/legal
> >
> > --
> > Gerrit Imsieke
> > Geschdftsf|hrer / Managing Director
> > le-tex publishing services GmbH
> > Weissenfelser Str. 84, 04229 Leipzig, Germany
> > Phone +49 341 355356 110, Fax +49 341 355356 510
> > gerrit.imsieke@xxxxxxxxx, http://www.le-tex.de
> >
> > Registergericht / Commercial Register: Amtsgericht Leipzig
> > Registernummer / Registration Number: HRB 24930
> >
> > Geschdftsf|hrer: Gerrit Imsieke, Svea Jelonek,
> > Thomas Schmidt, Dr. Reinhard Vvckler

--
Gerrit Imsieke
Geschdftsf|hrer / Managing Director
le-tex publishing services GmbH
Weissenfelser Str. 84, 04229 Leipzig, Germany
Phone +49 341 355356 110, Fax +49 341 355356 510
gerrit.imsieke@xxxxxxxxx, http://www.le-tex.de

Registergericht / Commercial Register: Amtsgericht Leipzig
Registernummer / Registration Number: HRB 24930

Geschdftsf|hrer: Gerrit Imsieke, Svea Jelonek,
Thomas Schmidt, Dr. Reinhard Vvckler