Here are five ways to sum over a computed quantity:

* In XPath 2.0, use sum(for $i in data return substring($i,7,4))

* Create a result tree fragment containing nodes whose value is the computed
number, and use sum(xx:node-set($rtf//value)) to do the summation, where
xx:node-set() is your vendor's extension function for converting an RTF to a
node-set

* Use a recursive named template (this is the only standard XSLT 1.0
solution). 

* Use the saxon extension function saxon:sum($nodes, saxon:expression(...))

* Use a higher-order function in the FXSL library

Michael Kay
http://www.saxonica.com/ 



> -----Original Message-----
> From: piming.kuo@xxxxxxxxxxxxx [mailto:piming.kuo@xxxxxxxxxxxxx] 
> Sent: 05 October 2005 14:47
> To: xsl-list@xxxxxxxxxxxxxxxxxxxxxx
> Subject:  sum partial of the text
> 
> 
> Is there any wavy to sum partial of the text? For example, I 
> want to sum
> all substring(data,7,4) from the following:
> 
> <segment>
>       <data>XXXYYY1000</data>
>       <data>XXXZZZ 100</data>
>       <data>SSSYYY1200</data>
> </segment>
> 
> The result will be:
> 1000 + 100 + 1200 = 2300
> 
> Have a nice day!
> 
> Piming Kuo