Reference Guide

This document provides detailed reference documentation for the raw protocol (XML and HTTP) for the Google Contacts Data API.

This document doesn't contain information about the programming-language client libraries. For client-library reference information, see the links from the programming-language-specific sections of the developer's guide.

Contents

Audience

This document is intended for programmers who want to write client applications that can interact with contacts.

It's a reference document; it assumes that you understand the concepts presented in the developer's guide, and the general ideas behind the Google Data APIs protocol.

Contacts feed types

The Contacts Data API provides two types of feed: contacts feed and contact groups feed.

The feeds are private read/write feeds that can be used to view and manage a user's contacts/groups. Since they are private, a programmer can access them only by using an authenticated request. That is, the request must contain an authentication token for the user whose contacts you want to retrieve. For more information about authenticating, see the developer's guide.

The representation of contact data depends on projection. Projection values indicate what data is included in the representation. For a list of values, see Projection values, below.

Contacts feed

The URL for a feed of contacts takes the following form:

http://www.google.com/m8/feeds/contacts/userID/projection

To request a particular representation of a contacts feed, userID (e-mail address) and projection value have to be specified.

Default can also be used instead of the user's e-mail address (it tells the server to return the contact groups for the user whose credentials accompany the request).

For example, the contacts feed for a user liz@gmail.com and projection full would have the following URL:

http://www.google.com/m8/feeds/contacts/liz%40gmail.com/full

Contact groups feed

Similarly to the contacts feed, the contact groups feed is specified by a userID (or default value) and projection:

http://www.google.com/m8/feeds/groups/userEmail/projection

Example: groups for a user liz@gmail.com with projection full can be obtained using the URL:

http://www.google.com/m8/feeds/groups/liz%40gmail.com/full

You can also substitute default for the user's email address, which tells the server to return the contact groups for the authenticated user whose credentials accompany the request.

Extended properties and projections

Extended properties

It is possible to set any additional contact- or contact group- related information as an exteded property (arbitrary name - value pair) for a contact or contact group entry. Preserving key uniqueness is a responsibility of clients. Value of the extended property may be stored as a value (arbitrary string) or an XML blob (these are mutually exclusive; instead of a valid XML blob plain text can be used). Each contact may have at most ten (10) extended properties associated. Each of them should be reasonably small, that is it should not be a photo, ringtone etc.

Example

Extended property with a key and a value:

<gd:extendedProperty name="com.google" value="some value"/>

Extended property with key and an XML blob:

<gd:extendedProperty name="com.google">
  <some_xml></some_xml>
</gd:extendedProperty>

To limit extended property visibility one can use projections: full, property-KEY or thin.

Projection values

Although the examples in this document use only the full projection, there are some other useful projections.

The following table describes the supported projection values:

Projection name	Description
thin	No gd:extendedProperty elements are returned/updated.
property-KEY	KEY indicates the key of an extended property (gd:extendedProperty element) that will be returned (for GET) or should be updated (for PUT/POST). Absence of the extended property during update operation deletes the property.
full	All gd:extendedProperty elements are returned and all of them have to be included during an update.

Contacts query parameters reference

The Contacts Data API supports the following standard Google Data API query parameters:

Name	Description
alt	The type of feed to return, such as atom (the default), rss, or json.
max-results	The maximum number of entries to return. If you want to receive all of the contacts, rather than only the default maximum, you can specify a very large number for max-results.
start-index	The 1-based index of the first result to be retrieved (for paging).
updated-min	The lower bound on entry update dates.

For more information about the standard parameters, see the Google Data APIs protocol reference document.

In addition to the standard query parameters, the Contacts Data API supports the following parameters:

Name	Description
orderby	Sorting criterion. The only supported value is lastmodified.
showdeleted	Include deleted contacts in the returned contacts feed. Deleted contacts are shown as entries that contain nothing but an <atom:id> element and a <gd:deleted> element. (Google usually retains placeholders for deleted contacts for 30 days after deletion; during that time, you can request the placeholders using the showdeleted query parameter.) Valid values are true or false. When the server decides it cannot guarantee that it still has information about all deleted contacts pertinent to the query, then it's behavior depends on the value of the requirealldeleted query parameter.
requirealldeleted	Only relevant if showdeleted and updated-min are also provided. It dictates the behavior of the server in case it detects that placeholders of some entries deleted since the point in time specified as updated-min may have been lost. If requirealldeleted is false, the server simply returns all the placeholders it still knows about. If true, the server returns the 410 HTTP response code. The default value is false.
sortorder	Sorting order direction. Can be either ascending or descending.
group	Constrains the results to only the contacts belonging to the group specified. Value of this parameter specifies group ID (see also: gContact:groupMembershipInfo).

Contacts elements reference

The Contacts Data API uses the standard Google Data API elements as well as elements specific for contacts.

In particular, a contact entry takes the form of an extended Contact kind, representing a person, a venue such as a club or a restaurant, or an organization.

The Contact kind appears in XML as an <atom:entry> element that contains various extension elements from the Google Data namespace. Besides these standard extensions, the Contacts API also supports additional extensions belonging to the gContact namespace.

For information about the standard Google Data API elements, see the Atom specification and the Kinds document.

The category element indicating that the entry is a contact looks like this:

<atom:category scheme="http://schemas.google.com/g/2005#kind"
  term="http://schemas.google.com/contact/2008#contact"/>

Extra restrictions on the standard Contact kind's extension elements

In the Contacts Data API, several elements are slightly more restrictive than indicated in the documentation for the Contact kind. In particular, a client must supply either a rel attribute or a label attribute, but not both, for the following elements:

• gd:email
• gd:im
• gd:organization
• gd:phoneNumber
• gd:postalAddress

Caution: When you create or update a contact, if you supply both rel and label (or neither) for any of those elements, then the server rejects the entry.

Besides this general rule, there are also specific restrictions on the use of several other elements from the gd namespace:

• gd:when
• gd:where
• gd:structuredPostalAddress

Restrictions on the use of gd:when

The Contacts API makes use of the gd:when as a subelement of gContact:event.

However, only the @startTime attribute is supported. Furthermore, its value must be a pure date, without the time component.

Restrictions on the use of gd:where

In the Contacts API, the gd:where element can be used in two contexts: directly under an entry of the Contact kind, or as a subelement of gd:organization.

However, the Contacts API does not support the gd:where element in all its generality: the only supported property is the @valueString attribute.

The attributes @rel and @label, as well as the gd:entryLink subelement, are not supported.

Because the @valueString property is the only supported one, it is required.

Restrictions on the use of gd:structuredPostalAddress

Not all the properties of gd:structuredPostalAddress are supported by the Contacts API.

The unsupported properties are the gd:agent, gd:housename, and gd:subregion subelements, and the attributes mailClass and usage.

gd:extendedProperty

Contact entry uses an extended gd:extendedProperty, which stores client-specific properties (see: Extended properties and projections).

An example of an entry with extended properties (with a full projection):

<entry gd:etag='"Q3k4cTVSLyp7ImA9WxRXFkwJRAA."'>
  <id>http://www.google.com/m8/feeds/contacts/liz%40gmail.com/base/8411573</id>
  <updated>2008-02-28T18:47:02.303Z</updated>
  <category scheme='http://schemas.google.com/g/2005#kind'
    term='http://schemas.google.com/contact/2008#contact' />
  <title>Jo</title>
  <content type='text'>Notes</content>
  <link rel='http://schemas.google.com/contacts/2008/rel#photo' type='image/*'
    href='http://www.google.com/m8/feeds/photos/media/liz%40gmail.com/8411573' />
  <link rel='self' type='application/atom+xml'
    href='http://www.google.com/m8/feeds/contacts/liz%40gmail.com/full/8411573' />
  <link rel='edit' type='application/atom+xml'
    href='http://www.google.com/m8/feeds/contacts/liz%40gmail.com/full/8411573' />
  <gd:phoneNumber rel='http://schemas.google.com/g/2005#other'
    primary='true'>456-123-2133</gd:phoneNumber>
  <gd:extendedProperty name='my-service-id' value='1234567890' />
  <gd:extendedProperty name='my-second-service'>
    <value-element>text value</value-element>
  </gd:extendedProperty>
</entry>

Important: Setting extended properties is allowed only within full or property-NAME projection.

Contact photos with atom:link

An <atom:link> element with rel="http://schemas.google.com/contacts/2008/rel#photo" provides a URL (in its href attribute) for adding, retrieving, updating, or deleting a contact's photo.

The photo link element appears for every contact, whether or not the contact has a photo. If a contact does not have a photo, then the photo link element has no gd:etag attribute.

Example photo link element, with ETag:

<link rel='http://schemas.google.com/contacts/2008/rel#photo' type='image/*'
    href='http://google.com/m8/feeds/photos/media/liz%40gmail.com/c9012de'
    gd:etag='"KTlcZWs1bCp7ImBBPV43VUV4LXEZCXERZAc."'/>

Note: When using photo links, an authorization token in HTTP header has to be specified. For more details please take a look at: Authenticating.

Additional extensions of the Contact kind

The Contacts API version 3.0 supports all the standard extensions of the Contact kind version 2.0, and introduces many other extensions belonging to the gContact namespace.

These additional extensions are enumerated in the following table.

Extension element	Description
gContact:billingInformation?	Contacts billing information.
gContact:birthday?	Contact's birthday.
gContact:calendarLink*	Link to a calendar associated with the contact.
gContact:directoryServer?	Directory server associated with the contact.
gContact:event*	Event associated with the contact.
gContact:externalId*	External identifier associated with the contact as set by a client
gContact:gender?	Gender associated with the contact.
gContact:groupMembershipInfo*	Group membership information.
gContact:hobby*	Hobby associated with the contact.
gContact:initials?	Contact's initials.
gContact:jot*	Jot associated with the contact.
gContact:language*	Language associated with the contact.
gContact:maidenName?	Maiden name associated with the contact.
gContact:mileage?	Mileage associated with the contact.
gContact:nickname?	Nickname associated with the contact.
gContact:occupation?	Occupation associated with the contact.
gContact:priority?	Priority ascribed to the contact.
gContact:relation*	Relation associated with the contact.
gContact:sensitivity?	Sensitivity ascribed to the contact.
gContact:shortName?	Contact's short name.
gContact:subject?	Subject associated with the contact.
gContact:userDefinedField*	User defined field attached to the contact.
gContact:website*	Website associated with the contact.

Contact groups elements reference

Schema

contactGroup = element atom:entry {
     atomCategory,
     atomUpdated,
     atomTitle,
     atomContent,
     element gd:deleted?,
     element gd:extendedProperty*,
     systemGroup?
}

The table below details contact groups schema:

Property	Description
atom:category	Scheme: http://schemas.google.com/g/2005#kind Term: http://schemas.google.com/g/2008#group
atom:updated	The modification time for a group is greater than or equal to the time the user actually modified the item. Applications should not use the modification time to break ties.
atom:title	Group's name.
atom:content	Group's name. Not directly updatable; changes whenever the name of the group is updated via atom:title.
gd:deleted	If present, denotes, that the group was deleted.
gd:extendedProperty*	Stores client-specific properties. There are client-specific projections created, that support independent read/modify on the properties.
gContact:systemGroup?	If present, indicates the group is a system group.

An example of a non-system contact group entry:

<entry xmlns="http://www.w3.org/2005/Atom"
       xmlns:gd="http://schemas.google.com/g/2005"
       gd:etag="&quot;Rno4ezVSLyp7ImA9WxdTEUgNRQU.&quot;">
    <category scheme="http://schemas.google.com/g/2005#kind"
              term="http://schemas.google.com/g/2005#group"/>
    <id>http://www.google.com/feeds/groups/jo%40gmail.com/base/1234</id>
    <published>2005-01-18T21:00:00Z</published>
    <updated>2006-01-01T00:00:00Z</updated>
    <app:edited xmlns:app="http://www.w3.org/2007/app">2006-01-01T00:00:00Z</app:edited>
    <title>Salsa class members</title>
    <content/>
    <link rel="self" type="application/atom+xml"
          href="http://www.google.com/m8/feeds/groups/jo%40gmail.com/full/1234"/>
    <link rel="edit" type="application/atom+xml"
          href="http://www.google.com/m8/feeds/groups/jo%40gmail.com/full/1234"/>
    <gd:extendedProperty name="more info">
        <description>A group that gathers salsa members.</description>
    </gd:extendedProperty>
</entry>

An example of a contact group entry for a system group:

<entry xmlns="http://www.w3.org/2005/Atom"
       xmlns:gContact="http://schemas.google.com/contact/2008"
       xmlns:gd="http://schemas.google.com/g/2005"
       gd:etag="&quot;YDwqeyI.&quot;">
    <id>http://www.google.com/m8/feeds/groups/jo%40gmail.com/base/16</id>
    <updated>1970-01-01T00:00:00.000Z</updated>
    <category scheme="http://schemas.google.com/g/2005#kind"
          term="http://schemas.google.com/contact/2008#group"/>
    <title>System Group: My Contacts</title>
    <content>System Group: My Contacts</content>
    <link rel="self" type="application/atom+xml"
          href="http://www.google.com/m8/feeds/groups/jo%40gmail.com/full/16"/>
    <gContact:systemGroup id="Contacts"/>
</entry>

Contact groups query parameters reference

Using the feed for contact groups one can use all of the query parameters available for the contact feed (see: Contacts query parameters reference) except for the group parameter.

Contacts feeds schema reference

1. Contacts Feed
2. Contact Groups Feed

gContact namespace reference

The XML namespace http://schemas.google.com/contact/2008 contains many contacts-specific elements.

It is usually referred to using the alias gContact.

gContact:billingInformation

Specifies billing information of the entity represented by the contact. The element cannot be repeated.

Example

The contact's billing address is:

John Doe

1600 Amphitheatre Parkway

Mountain View, CA 94043

<gContact:billingInformation>1600 Amphitheatre Parkway
Mountain View, CA 94043</gContact:billingInformation>

gContact:birthday

Stores birthday date of the person represented by the contact. The element cannot be repeated.

Properties

Property	Description
when	Birthday date, given in format YYYY-MM-DD (with the year), or --MM-DD (without the year).

Example

Person born on July 4, 1980:

<gContact:birthday when='1980-7-4'/>

Person born on December 25th, with no year specified:

<gContact:birthday when='--12-25'/>

gContact:calendarLink

Storage for URL of the contact's calendar. The element can be repeated.

Properties

Property	Description
rel	Predefined calendar link type. Can be one of work, home or free-busy.
label	User-defined calendar link type.
primary	Boolean flag denoting the calendar link as primary.
href	The URL of the calendar.

Attributes rel and label are mutually exclusive (but one must be specified). Only one calendar link can be marked as primary at a time.

Example

Two links to user's calendars. The first is of custom type "Phases of the Moon," the second is of predefined type home. The latter is marked as primary.

<gContact:calendarLink
     label='Phases of the Moon'
     href='http://www.google.com/calendar/embed?src=aHQzamxmYWFjNWxmZDYyNjN1bGZoNHRxbDhAZ3JvdXAuY2FsZW5kYXIuZ29vZ2xlLmNvbQ'/>
<gContact:calendarLink
     rel='home'
     href='http://www.google.com/calendar/render?tab=mc&gsessionid=jhds76iaJKHAGi78tweKJHG'
     primary='true'/>

gContact:directoryServer

A directory server associated with this contact. May not be repeated.

Properties

Property	Type	Description
text()	xs:string	The name or address of the directory server. May not be empty or all whitespace. Other than that, the Contacts API does not constrain the form of the string describing the directory server in any way.

gContact:event

These elements describe events associated with a contact. They may be repeated.

Property	Type	Description
@label?	xs:string	A simple string value used to name this event. It allows UIs to display a label such as "Start Date". May not be empty or all whitespace.
@rel?	xs:string	A programmatic value that identifies the type of event.
gd:when	when	Gives the time of the event. Warning: not every correct gd:when can be used: its startTime attribute must be of type xs:date.

Rel values

Value	Description
anniversary	An anniversary
other	Other event type

Note: Exactly one of the label and rel attributes must be provided.

gContact:externalId

Describes an ID of the contact in an external system of some kind. This element may be repeated.

Property	Type	Description
@label?	xs:string	A simple string value used to name this ID.
@rel	xs:string	A programmatic value that identifies the type of external ID.
@value	xs:string	The value of this external ID.

Rel values

Value	Description
account	Contact's account number.
customer	Contact's customer ID.
network	Network identifier of the contact.
organization	Identifier related to an organization the contact is associated with.

gContact:gender

Specifies the gender of the person represented by the contact. The element cannot be repeated.

Properties

Property	Description
value	The person's gender, either male or female

Example

The person is a male:

<gContact:gender value='male'/>

gContact:groupMembershipInfo

Properties

Property	Description
href	Identifies the group to which the contact belongs or belonged. The group is referenced by its id.
deleted="true"?	Means, that the group membership was removed for the contact. This attribute will only be included if showdeleted is specified as query parameter, otherwise groupMembershipInfo for groups a contact does not belong to anymore is simply not returned.

Example

Contact was deleted from the group http://www.google.com/feeds/contacts/groups/jo%40gmail.com/base/1234a and is in group http://www.google.com/feeds/contacts/groups/jo%40gmail.com/base/1234b:

<gContact:groupMembershipInfo href="http://www.google.com/feeds/contacts/groups/jo%40gmail.com/base/1234a" deleted="true"/>
<gContact:groupMembershipInfo href="http://www.google.com/feeds/contacts/groups/jo%40gmail.com/base/1234b"/>

gContact:hobby

Specifies hobbies or interests of the person specified by the contact. The element can be repeated.

Example

The person's hobbies are paragliding, tennis and fishing:

<gContact:hobby>Paragliding</gContact:hobby>
<gContact:hobby>Tennis</gContact:hobby>
<gContact:hobby>Fishing</gContact:hobby>

gContact:initials

Specifies the initials of the person represented by the contact. The element cannot be repeated.

Example

The person's initials are J.F.K.:

<gContact:initials>J.F.K.</gContact:initials>

gContact:jot

Storage for arbitrary pieces of information about the contact. Each jot has a type specified by the rel attribute and a text value. The element can be repeated.

Properties

Property	Description
rel	Specifies the type of the jot. Can be one of the following values: home, work, other, keywords, user.

Example

The contact has two jots:

• Home: Lived in Orange County
• User: Borrowed my copy of "Alice's Adventures in Wonderland"

<gContact:jot rel='home'>Lived in Orange County</gContact:rel>
<gContact:jot rel='user'>Borrowed my copy of "Alice's Adventures in Wonderland"</gContact:rel>

gContact:language

Specifies the preferred languages of the contact. The element can be repeated.

The language must be specified using one of two mutually exclusive methods: using the freeform @label attribute, or using the @code attribute, whose value must conform to the IETF BCP 47 specification.

Properties

Property	Type	Description
@code?	xs:string	A language code conforming to the IETF BCP 47 specification. The server returns an error if a nonconformant value is provided.
@label?	xs:string	A freeform name of a language. Must not be empty or all whitespace.

When storing a <gContact:language> element that makes use of the @code attribute, the server is allowed to perform some normalization, for example to replace "en-us" with "en-US".

Example

The contact uses two languages to write messages - Russian and Australian English:

<gContact:language label='Russian' />
<gContact:language code='en-AU' />

gContact:maidenName

Specifies maiden name of the person represented by the contact. The element cannot be repeated.

Example

The person's maiden name is Smith:

<gContact:maidenName>Smith</gContact:maidenName>

gContact:mileage

Specifies the mileage for the entity represented by the contact. Can be used for example to document distance needed for reimbursement purposes. The value is not interpreted. The element cannot be repeated.

Example

The contact is 156 miles away:

<gContact:mileage>156 mi</gContact:mileage>

gContact:nickname

Specifies the nickname of the person represented by the contact. The element cannot be repeated.

Example

The person's nickname is Dragon:

<gContact:nickname>Dragon</gContact:nickname>

gContact:occupation

Specifies the occupation/profession of the person specified by the contact. The element cannot be repeated.

Example

The person is a carpenter:

<gContact:occupation>Carpenter</gContact:occupation>

gContact:priority

Classifies importance of the contact into 3 categories:

• Low
• Normal
• High

The priority element cannot be repeated.

Properties

Property	Description
rel	Specifies contact's priority. Can be either low, normal or high.

Example

Contact's priority high:

<gContact:priority rel="high"/>

gContact:relation

This element describe another entity (usually a person) that is in a relation of some kind with the contact.

The gContact:relation element may be repeated.

Property	Type	Description
@label?	xs:string	A simple string value used to name this relation. The value must not be empty or all whitespace.
@rel?	xs:string	A programmatic value that identifies the type of relation.
text()	xs:string	The entity in relation with the contact.

Rel values

Value	Description
assistant	Contact's assistant.
brother	Contact's brother.
child	Contact's child.
domestic-partner	Contact's domestic partner.
father	Contact's father.
friend	Contact's friend.
manager	Contact's manager.
mother	Contact's mother.
parent	Contact's parent.
partner	Contact's (business) partner.
referred-by	Contact's referrer.
relative	Contact's relative.
sister	Contact's sister.
spouse	Contact's spouse.

Note: Exactly one of the label and rel attributes must be provided.

Example

Several relations ascribed to a contact

<gContact:relation rel="spouse">Katherine</gContact:relation>
<gContact:relation label="drinking buddy">Marvin</gContact:relation>
<gContact:relation rel="brother">Mike</gContact:relation>

gContact:sensitivity

Classifies sensitivity of the contact into the following categories:

• Confidential
• Normal
• Personal
• Private

The sensitivity element cannot be repeated.

Properties

Property	Description
rel	Specifies contact's sensitivity. Can be either confidential, normal, personal or private.

Example

Contact's sensitivity private:

<gContact:sensitivity rel="private"/>

gContact:shortName

Specifies short name of the person represented by the contact. The element cannot be repeated.

Example

The person's short name is Bill:

<gContact:shortName>Bill</gContact:shortName>

gContact:subject

Specifies the subject of the contact. The element cannot be repeated.

Example

The contact's subject is "Statistics report":

<gContact:subject>Statistics report</gContact:subject>

gContact:systemGroup

When used within a contact group entry, indicates that the group in question is one of the predefined system groups.

Properties

Property	Description
@id	System group identifier.

Values of id

The id attribute can have any one of the following values:

Contacts

The My Contacts system group.

Friends

The Friends system group.

Family

The Family system group.

Coworkers

The Coworkers system group.

gContact:userDefinedField

Represents an arbitrary key-value pair attached to the contact.

Property	Type	Description
@key	xs:string	A simple string value used to name this field. Case-sensitive.
@value	xs:string	The value of this field.

Example

<gContact:userDefinedField key="chess" value="likes playing black"/>
<gContact:userDefinedField key="food" value="Chinese"/>

gContact:website

Describes websites associated with the contact, including links. May be repeated.

Property	Type	Description
@href	xs:string	A link to the website.
@label?	xs:string	A simple string value used to name this website.
@primary?	xs:string	When multiple websites appear in an entry, indicates which is primary. At most one website may be primary. Default value is false.
@rel	xs:string	A programmatic value that identifies the type of a website.

Rel values

Value	Description
home-page	The home page of the contact.
blog	Contact's blog.
profile	Contact's profile.
home	Contact's home-related site.
work	Contact's work-related site.
other	Contact's site of other type.
ftp	Contact's FTP site.