get_primary_authorization_domain

The primary AuthorizationDomain for interacting with PicasaWeb.

This will not normally need to be used, as it's used internally by the PicasaWebService methods. However, if using the plain Service methods to implement custom queries or requests which libgdata does not support natively, then this domain may be needed to authorize the requests.

The domain never changes, and is interned so that pointer comparison can be used to differentiate it from other authorization domains.

Returns: