Contributed by HTRI, "Cross Technology Integration Specialists", http://www.htri.com/


This library is used to retreive shipping cost estimates from the UPS XML API. You can submit to/from zip codes, and get back the cost for a specific shipping type, or get back a list
of costs for all possible shipping types.

See <a href="http://svn.symfony-project.com/plugins/sfUPSShippingPlugin/test/sfUPSShippingTest.php">test/sfUPSShippingTest.php</a> for examples on useage of the API.