Webdav adding contacts

Does anyone have an example of adding/deleting contacts from an
Exchange server using webdav?

I found this link http://support.microsoft.com/kb/296126 but can figure
out how to use the proppatch method in Ruby.

Any ideas would be greatly appreciated.

thanks,

Luis

BTW, I’ve already looked at RExchange but it only allows me to view and
search the contacts.