Re: [xsl] Problem with xslt recursion

[Wendell Piez <wapiez@xxxxxxxxxxxxxxxx>]

Hi Roopesh,

At 11:15 AM 2/10/2004, you wrote:
> Hi..
> This is my first doubt with this group..hope i get
> some help..
>
>
> I have the following xml...
> <UIComponents>
> <Component name = "EntrySpecialMessageAddButton">
>     <ResourceType>Composite</ResourceType>
>     <ResourceTypeSet>
>         <Type>R1</Type>
>         <Type>R2</Type>
>         <Type>R3</Type>
>     </ResourceTypeSet>
> </Component>
> </UIComponents>
>
> and i have a recursive call to a template whose
> function is to concatenate all the values with the tag
> name Type..(The actual functionality of the template
> is more than what is being described here..which
> cannot be disclosed)

Of course I can't speak to the actual functionality not being disclosed, 
but if all that needs to be done is to concatenate the values, this doesn't 
require recursion.

Can you be a little bit more explicit about why you require recursion here 
and what it's doing for you? (code reformatted for legibility)

> <xsl:template name="build">
>   <xsl:param name="ResourceName"/>
>   <xsl:param name="Index"/>
>   <xsl:param name="Count"/>
>   <xsl:variable name="try">
>     <xsl:value-of select ="ResourceTypeSet/Type[$In]"/>
>   </xsl:variable>
>   <xsl:if test="$Index &lt; $Count">
>     <xsl:call-template name="buildResourceName">

The template called here is "buildResourceName", but no template by that 
name appears in the code sample.

>       <xsl:with-param name="ResourceName">
>         <xsl:value-of select="concat($ResourceName,$TempResource)"/>

It's also not apparent from your code what $ResourceName and $TempResource 
are....

>       </xsl:with-param>
>       <xsl:with-param name="Index">
>         <xsl:value-of select="$Index+1"/>
>       </xsl:with-param>
>       <xsl:with-param name="Count" select="$Count"></xsl:with-param>
>     </xsl:call-template>
>   </xsl:if>
> </xsl:template>
>
> The initial call to the template is as follows
>
> <xsl:call-template name="build">
>   <xsl:with-param name="ResourceName"/>
>   <xsl:with-param name="Index" select="1"/>
>   <xsl:with-param name="Count" select="$Count+1">
> </xsl:call-template>
>
> The problem is that for each recursive call to the
> template the value of try remains R1...
> whereas it should have been R1 in the first call..
> R2 for the next call..and R3 for the third cal..

It's difficult to say given just the code you've supplied (no 
"buildResourceName" template) ... a number of things here are simply 
mystifying. Without knowing what the template is actually supposed to be 
doing, it's impossible to diagnose.

Maybe the call to "buildResourceName" is supposed to be the recursive call 
to "build" itself. If this is the case, the role of the $Count variable 
needs to be clarified -- this is intended to specify the limit of your 
recursion? How is this determined?

It also appears that you mean to bind the variable $try to the values of 
the Type elements in turn, but it's not clear why since nothing is then 
done with this variable.

If you are only concatenating, you don't need to jump through so many 
hoops, but can simply copy the nodes' values to output using any of several 
methods (all easier than recursion). But you've said you aren't really 
concatenating. Seeing the actual requirement, or failing that something 
closer to it, would help us determine what the best approach is in your case.

Cheers,
Wendell


======================================================================
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
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