[xslt] data callbacks?

[Paul Miller <paul fxtech com>]

Just came across libxslt and it's brilliant (and fast!). I was thinking 
about embedding it into an app as a report generator and I think what I 
want to do is possible, but I wanted to double-check here first.

I'd like to write some XML that describes a report - basic layout 
information plus what columns/rows of data to output. But there is no 
actual data in this XML - the data needs to be generated on the fly 
within my application. I'd like to stick some custom elements or 
attributes that cause libxslt to call back into my application using a 
callback function and replace that element with possibly more elements 
with specific text nodes.

For example, let's say I have an element like this:

   <data id="income" range="5"/>

In my template, I'd like to convert this to something like this in the 
resulting XML:

   <data>100.00</data>
   <data>200.00</data>
   <data>300.00</data>
   <data>400.00</data>
   <data>500.00</data>

So what I'd like to happen is for the xslt to see the "range" and "id" 
attributes and then call back into my code with information about this 
element. Then I'd like my code to replace this element with its own set 
of elements, filling in the data values as it goes.

Is this possible? Is this a good idea? Any suggestions on what API to 
use to handle this?

--
Paul Miller | paul fxtech com | www.fxtech.com | Got Tivo?