com.google.gdata.data.extensions
Classes 
BaseEventEntry
BaseEventEntry.EventStatus
BaseEventEntry.Transparency
BaseEventEntry.Visibility
BaseEventFeed
Comments
ContactEntry
ContactFeed
Deleted
Email
Email.Rel
EntryLink
EventEntry
EventFeed
ExtendedProperty
ExtendedProperty.Realm
FeedLink
GeoPt
Im
Im.Protocol
Im.Rel
Image
Image.Rel
Labels
MessageEntry
MessageFeed
Money
Organization
Organization.Rel
OrgDepartment
OrgJobDescription
OrgName
OrgSymbol
OrgTitle
OriginalEvent
PhoneNumber
PhoneNumber.Rel
PostalAddress
PostalAddress.Rel
Rating
Rating.Rel
Recurrence
RecurrenceException
Reminder
When
Where
Where.Rel
Who
Who.AttendeeStatus
Who.AttendeeType
Who.Rel
Enums 
Reminder.Method