com.google.gdata.data.extensions
Classes 
AdditionalName
Agent
BaseEventEntry
BaseEventEntry.EventStatus
BaseEventEntry.Transparency
BaseEventEntry.Visibility
BaseEventFeed
City
Comments
ContactEntry
ContactFeed
Country
CustomProperty
Deleted
Email
Email.Rel
EntryLink
EventEntry
EventFeed
ExtendedProperty
ExtendedProperty.Realm
FamilyName
FeedLink
FormattedAddress
FullName
GeoPt
GivenName
HouseName
Im
Im.Protocol
Im.Rel
Image
Image.Rel
Labels
LastModifiedBy
LastViewed
MessageEntry
MessageFeed
Money
Name
NamePrefix
NameSuffix
Neighborhood
Organization
Organization.Rel
OrgDepartment
OrgJobDescription
OrgName
OrgSymbol
OrgTitle
OriginalEvent
PhoneNumber
PhoneNumber.Rel
PoBox
PostalAddress
PostalAddress.Rel
PostCode
QuotaBytesTotal
QuotaBytesUsed
Rating
Rating.Rel
Recurrence
RecurrenceException
Region
Reminder
ResourceId
Street
StructuredPostalAddress
StructuredPostalAddress.MailClass
StructuredPostalAddress.Rel
StructuredPostalAddress.Usage
Subregion
When
Where
Where.Rel
Who
Who.AttendeeStatus
Who.AttendeeType
Who.Rel
Enums 
Reminder.Method