Google data services are based upon the Atom Publishing Protocol
(APP) and the Atom syndication format. To interact with APP or
Google services using the Zend_Gdata component, you need to use
the service classes such as Zend_Gdata_App,
Zend_Gdata, Zend_Gdata_Spreadsheets, etc.
These service classes provide methods to retrieve data from services as feeds, insert
new entries into feeds, update entries, and delete entries.
Note: A full example of working with Zend_Gdata is available in
the demos/Zend/Gdata directory. This example is runnable
from the command-line, but the methods contained within are easily
portable to a web application.