sum(book[column[@name='status']='available']/column[@name='quantity'])

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

> -----Original Message-----
> From: peter verhaar [mailto:peter.verhaar1@xxxxxxxxx] 
> Sent: 12 December 2008 10:22
> To: xsl-list@xxxxxxxxxxxxxxxxxxxxxx
> Subject:  Multi condition sum [Correction]
> 
> Hello,
> 
> Sorry my last message was send to early.
> 
> I have one question. assume this snippet:
> 
> <books>
>  <book>
>    <column name="quantity">50</column>
>    <column name="status">available</column>  </book>  <book>
>    <column name="quantity">10</column>
>    <column name="status">available</column>  </book>  <book>
>    <column name="quantity">3</column>
>    <column name="status">lost</column>
>  </book>
> </books>
> 
> 
> Now I want to add all Quantity IF Status = "Available".
> 
> All sum is this: sum(books/book[@name="quantity"])
> 
> but how to add the Status = "Available" condition???
> 
> Thank you