Extended properties and projections

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To define custom characteristics for a shared contact, use extended properties and projections.

Extended properties

You can set additional shared contact related information as an extended property, with arbitrary name-value pairs, for a shared contact entry. It's your responsibility to preserve key uniqueness. The value of an extended property can be stored as a value (arbitrary string) or an XML blob (plain text). Each shared contact can have at most 10 extended properties associated. Each extended property should be reasonably small; don't use a photo or a ringtone.


The following example shows an extended property with a key and a value:

&lt;gd:extendedProperty name="com.google" value="<var>VALUE</var>"/&gt;

The following example shows an extended property with key and an XML blob:

&lt;gd:extendedProperty name="com.google"&gt;

Projection values

To limit extended property visibility, use projections. Setting extended properties (gd:extendedElement elements) is allowed only within a full or property-KEY projection.

The following table describes the supported projection values:

Projection name Description
thin No gd:extendedProperty elements are returned or updated.
property-KEY KEY indicates the key of an extended property (gd:extendedProperty element) that's returned (for GET requests) or should be updated (for a PUT or POST request). If the extended property isn't used during update operations, the property is deleted.
full All gd:extendedProperty elements are returned and all elements have to be included during an update.