Use the get method to retrieve the information of an entity or entities.
To retrieve an entity, the entity data object with its Identifier is added under the root data object. Multiple entities can be retrieved in one get method call by adding multiple entity data objects under the root.
By specifying different controls, different information can be returned. For example, PropertyControl is used for returning the properties of the entities. GroupMembershipControl is used for returning groups that the entities belong to.