RE: [xsl] Linking Variable to the Path

["Yaswanth Kumar Ravella" <yaswanth.mtrx@xxxxxxxxx>]

Hi Peter,
Thanks,
This will work fine for me only when I have @destination as
//every[..]/event[...]
As u guessed this will not be always same or say never same again !
I am working on implementing dyn:evaluate function !
http://www.xmleverywhere.com/tips/xslt.htm 

but I am unable to work with it !

Any idea about how to use this function or any other technique that would be
best suited for this situation?

Regards
Yaswanth Ravella





-----Original Message-----
From: Hofman, Peter [mailto:peter.hofman@xxxxxxxxxxxxx] 
Sent: Wednesday, August 22, 2007 2:28 PM
To: Yaswanth Kumar Ravella
Subject: RE: [xsl] Linking Variable to the Path 

Just not possible dynamically.

It seems you expect $dest to be substituted in the following xpath
expression. This is not happening.
The select you do in setting the variable $dest gives you a sequence of
attribute values.
There is no substitution when you use the variable.

Assuming the @destination always contains '//every[..]/event[...]'
(which will most probably not be the case) you need something like this
to get the name:

Keep the dest selection as you have and then do following (of course
only one solution, which is based on an assumption too):

	<xsl:variable name="every"
select="substring-before(substring-after($dest,'/every['),']')"/>
<xsl:variable name="event"
select="substring-before(substring-after($dest,'/event['),']')"/>
	<xsl:value-of select="//every[$every]/event[$event]/@name"/>

As you can see, you may need a lot of analyzing of the @destination when
my assumption is not correct.

Regards,
Peter
 

>-----Original Message-----
>From: Yaswanth Kumar Ravella [mailto:yaswanth.mtrx@xxxxxxxxx] 
>Sent: woensdag 22 augustus 2007 10:36
>To: xsl-list@xxxxxxxxxxxxxxxxxxxxxx
>Cc: Hofman, Peter
>Subject: RE: [xsl] Linking Variable to the Path 
>
>Hi Peter and Everyone out there!
>  Thanks for the reply ~
>
>I have '//every[1]/event[1]' as the destination attributes value.
>And there is 'name' attribute  for '//every[1]/event[1]'
>i.e //every[1]/event[1]/@name gives me the Value 'Ready'.
>
>Why not $dest/@name gives me the same ?
>How to get it  ?
>
>Regards
>Yaswanth 
>
>
Hi Yaswanth, 

> Hi Peter and Everyone out there!
>   Thanks for the reply ~
> 
> I have '//every[1]/event[1]' as the destination attributes value.
> And there is 'name' attribute  for '//every[1]/event[1]'
> i.e //every[1]/event[1]/@name gives me the Value 'Ready'.
> 
> Why not $dest/@name gives me the same ?
> How to get it  ?

In your fisrt xsl <xsl:variable name="dest"
select="//every[1]/event[1]"/>  will get a *node* /root/every[1]/event[1], 
which do has a @name attribute. Then $dest/@name will get this attribute
value.

But in your second xsl  <xsl:variable name="dest"
select="//pattern[1]/connection[1]/@destination"/>   will get the *string*
"//every[1]/event[1]"
which is the value of @destination. $dest is not a node, it's a string and
you can't do $dest/@name, it doesn't make sens.

As said Christoph you need to evaluate the string, and there is
unfortunately no xslt 1.0 native way to do this !
You need a extension eval function depending on your xslt processor. 
If you use saxon for example, something like this should go <xsl:value-of
select="saxon:eval($dest)/@name"/>.
With msxml you can do your own eval function in jscript, have a look at
http://www.xmleverywhere.com/tips/xslt.htm
You can also use EXSLT extensions I think.

Hope this help, 

Cheers, 

Matthieu.

>-----Original Message-----
>From: Hofman, Peter [mailto:peter.hofman@xxxxxxxxxxxxx]
>Sent: Wednesday, August 22, 2007 1:54 PM
>To: xsl-list@xxxxxxxxxxxxxxxxxxxxxx
>Subject: RE: [xsl] Linking Variable to the Path 
>
>Your variable $dest contains a sequence of destination 
>attributes values, which (of course) do not contain a name attribute.
>
>You need to analyze the contents of connection/@destination 
>and use this in a selection of event elements.
>
>Regards,
>Peter
>
>>-----Original Message-----
>>From: Yaswanth Kumar Ravella [mailto:yaswanth.mtrx@xxxxxxxxx]
>>Sent: woensdag 22 augustus 2007 10:16
>>To: xsl-list@xxxxxxxxxxxxxxxxxxxxxx
>>Subject: [xsl] Linking Variable to the Path
>>
>>
>>Hi,
>>
>>::I am having an XML file like this ::
>>
>><root>
>> <every>
>>   <event name="Ready"/>
>> </every>
>> <pattern>
>>   <connection destination="//every[1]/event[1]" />		
>> </pattern>
>></root>
>>-------------------------------
>>::When my XSL file has this code::
>>
>><xsl:template match="root">   
>>   <xsl:variable name="dest" 	select="//every[1]/event[1]"/>   
>>   <xsl:value-of select="$dest/@name"/>   
>></xsl:template>
>>
>>It prints 'Ready'.
>>Here I am directly assigning variable 'dest' to the path of the event.
>>This is ok.
>>-------------------------------
>>::When I changed my XSL code to ::
>>
>><xsl:template match="root">   
>>   <xsl:variable name="dest"
>>select="//pattern[1]/connection[1]/@destination"/>   
>>   <xsl:value-of select="$dest/@name"/>   
>></xsl:template>
>>
>>It doesn't print 'Ready' or anything.
>>Here I am storing variable 'dest' with the value of the 
>>'connection/@destination', Which I expected to work properly 
>>but it is not working.
>>------------------------------
>>
>>How can I print 'event-name' using 'connection-destination'?
>>
>>
>>Regards
>>Yaswanth Ravella
>>
>>
>
>
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