URL caching with XMLDoc from url

FROM : Eric Blanpied
DATE : Mon Jul 31 20:00:02 2006

I'm using NSXMLDocument's initWithContentsOfURL: method, and I think 
I'm running into some issues with NSURL caching the data at times. I 
see that there are lots of options with NSURLRequest and it's 
brethren, but it's not clear to me how to merge this with the NSURL 
required by NSXMLDocument's initWithContentsOfURL:

Any pointers on this would  be great.

thanks

-eric