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Re: [xsl] XSLT grouping(?) issue

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Thanks Wendell! :) Merry christmas to you!


--- Den men 2008-12-22 skrev Wendell Piez <wapiez@xxxxxxxxxxxxxxxx>:

> Fren: Wendell Piez <wapiez@xxxxxxxxxxxxxxxx>
> Dmne: Re: [xsl] XSLT grouping(?) issue
> Till: xsl-list@xxxxxxxxxxxxxxxxxxxxxx
> Datum: mendag 22 december 2008 18.16
> Fredde,
>
> > You've given me hope by saying it is solvable.
> Will this new XML-fragment allow you to show me how? That
> would basically save christmas for me...
>
> That's irresistible.
>
> As Mike suggested, this problem is ready-made for XSLT 2.0
> group-starting-with.
>
> An XSLT 1.0 solution is not complicated, but it is subtle:
>
> <xsl:key name="item-by-group"
>  match="*[Id]"
>  use="generate-id(
>    (preceding-sibling::StartOrderGroup |
>     preceding-sibling::EndOrderGroup)[last()])"/>
>
> <xsl:template match="Orders">
>   <xsl:apply-templates
> select="StartOrderGroup"/>
> </xsl:template>
>
> <xsl:template match="StartOrderGroup">
>
> <xsl:text>&#xA;&#xA;Order&#xA;-----</xsl:text>
>   <xsl:apply-templates
> select="key('item-by-group',generate-id())"
> mode="out"/>
> </xsl:template>
>
> <xsl:template match="Car | Bus | Truck"
> mode="out">
>   <xsl:text>&#xA;</xsl:text>
>   <xsl:value-of select="local-name()"/>
>   <xsl:text> - </xsl:text>
>   <xsl:value-of select="Id"/>
> </xsl:template>
>
> <xsl:template match="StartOrderGroup |
> EndOrderGroup" mode="out"/>
>
> Notice that this ignores the Id elements on the
> StartOrderGroup (the system generated ID is more robust for
> these purposes), and ignores EndOrderGroup elements
> altogether. The trickiest thing is the way the key matches
> elements to an EndOrderGroup when they fall after a group
> ends but before the next group starts, so they can be
> skipped.
>
> Cheers,
> Wendell
>
> > Order
> > -----
> > Car - 2
> > Car - 3
> > Bus - 4
> >
> > Order
> > -----
> > Truck - 9
>
> At 05:37 AM 12/22/2008, you wrote:
> > > The problem is solvable with XSLT, provided your
> input XML
> > > is well
> > > formed. But your input is not a valid XML
> document.
> > >
> > > for e.g., <Id=1/> is not a valid XML
> fragment, and
> > > XML parser
> > > complains about it.
> >
> > My mistake, I apologize. When I simplified my XML I
> made it more bad formed than it really is...
> >
> > <Orders>
> >   <StartOrderGroup>
> >     <Id>1</Id>
> >   </StartOrderGroup>
> >   <Car>
> >     <Id>2</Id>
> >   </Car>
> >   <Car>
> >     <Id>3</Id>
> >   </Car>
> >   <Bus>
> >     <Id>4</Id>
> >   </Bus>
> >   <EndOrderGroup>
> >     <Id>5</Id>
> >   </EndOrderGroup>
> >   <Car>
> >     <Id>6</Id>
> >   </Car>
> >   <Truck>
> >     <Id>7</Id>
> >   </Truck>
> >   <StartOrderGroup>
> >     <Id>8</Id>
> >   </StartOrderGroup>
> >   <Truck>
> >     <Id>9</Id>
> >   </Truck>
> >   <EndOrderGroup>
> >     <Id>10</Id>
> >   </EndOrderGroup>
> > </Orders>
>
>
> ======================================================================
> Wendell Piez
> mailto:wapiez@xxxxxxxxxxxxxxxx
> 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
> ----------------------------------------------------------------------
>   Mulberry Technologies: A Consultancy Specializing in SGML
> and XML
> ======================================================================


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