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    'description' => t('Images occurring in the description element of a feed item.'),

 *   An array whose keys are the target name and whose values are arrays

 *   containing the following keys:

 *   - name: A human readable, translated label for the target.

 *   - description: (optional) A human readable, translated description for the

 *     target.

 *   - callback: The callback used to set the value on the target.

 *   - real_target: (optional) the name of the property on the entity that will

 *     be set by the callback. Specify this if the target name is not equal to

 *     the entity property name. This information will be used to clear the

 *     right target at the beginning of the mapping process.

 *   - optional_unique: (optional) A boolean that indicates whether or not the

 *     target can be used as an unique target. If you set this to TRUE, be sure

 *     to also specify "unique_callbacks".

 *   - unique_callbacks: (optional) An array of callbacks that are used to

 *     retrieve existing entity ids. Existing entities can be updated based on

 *     unique targets.

 *   - form_callbacks: (optional) An array of callbacks that are used to return

 *     a form with additional configuration for a target.

 *   - summary_callbacks: (optional) An array of callbacks that are used to

 *     display values of additional target configuration.

 *   - preprocess_callbacks: (optional) An array of callbacks that are used to

 *     set or change mapping options.

 *   - deprecated: (optional) A boolean that if TRUE, hides the target from the

 *     UI. Use this if you want to rename targets for consistency, but don't

 *     want to break importers that are using the old target name. If an

 *     importer uses this target it will show up as "DEPRECATED" in the UI.

    // Example 1: provide the minimal info for a target. Description is

    // optional, but recommended.

    // @see my_module_set_target()

    // Example 2: specify "real_target" if the target name is different from

    // the entity property name.

    // Here the target is called "my_node_field2:uri", but the entity property

    // is called "my_node_field2". This will ensure that the property

    // "my_node_field2" is cleared out that the beginning of the mapping

    // process.

    $targets['my_node_field2:uri'] = array(

      'name' => t('My third custom node field'),

      'description' => t('A target that sets a property that does not have the same name as the target.'),

      'real_target' => 'my_node_field2',

    // Example 3: you can make your target selectable as an unique target by

    // setting "optional_unique" to TRUE and specify one or more callbacks to

    // retrieve existing entity id's.

    // @see my_module_mapper_unique()

      'description' => t('A field that can be set as an unique target.'),

    );

    // Example 4: use the form and summary callbacks to add additional

    // configuration options for your target. Use the form callbacks to provide

    // a form to set the target configuration. Use the summary callbacks to

    // display the target configuration.

    // @see my_module_form_callback()

    // @see my_module_summary_callback()

    $targets['my_node_field4'] = array(

      'name' => t('My fourth custom node field'),

      'description' => t('A field with additional configuration.'),

      'callback' => 'my_module_set_target4',

      'form_callbacks' => array('my_module_form_callback'),

      'summary_callbacks' => array('my_module_summary_callback'),

    );

    // Example 5: use preprocess callbacks to set or change mapping options.

    // @see my_module_preprocess_callback()

    $targets['my_node_field5'] = array(

      'name' => t('My fifth custom node field'),

      'description' => t('A field with additional configuration.'),

      'callback' => 'my_module_set_target5',

    // Example 6: when you want to remove or rename previously provided targets,

    // you can set "deprecated" to TRUE for the old target name. This will make

    // the target to be no longer selectable in the UI. If an importer uses this

    // target it will show up as "DEPRECATED" in the UI.

    // If you want that the target continues to work, you can still specify the

    // callback.

    $targets['deprecated_target'] = array(

      'name' => t('A target that cannot be chosen in the UI.'),

      'deprecated' => TRUE,

    );

  // Example: set an existing target as optional unique.

/**

 * Example of the form_callback specified in hook_feeds_processor_targets().

 *

 * The arguments are the same that my_module_summary_callback() gets.

 *

 * @return array

 *   The per mapping configuration form. Once the form is saved, $mapping will

 *   be populated with the form values.

 *

 * @see my_module_summary_callback()

 */

function my_module_form_callback(array $mapping, $target, array $form, array $form_state) {

  return array(

    'my_setting' => array(

      '#type' => 'checkbox',

      '#title' => t('My setting checkbox'),

      '#default_value' => !empty($mapping['my_setting']),

    ),

  );

}

function my_module_preprocess_callback(array $target, array &$mapping) {