Choice_Element_Type_Interface

interface Choice_Element_Type_Interface {

	/**
	 * Returns the available choices.
	 *
	 * @since 1.0.0
	 *
	 * @param Element $element Element to get choices for.
	 * @return array Associative array of `$field => $choices` pairs, with the main element field having the key '_main'.
	 */
	public function get_choices( $element );

	/**
	 * Returns the available choices for a specific field.
	 *
	 * @since 1.0.0
	 *
	 * @param Element $element Element to get choices for.
	 * @param string  $field   Optional. Element field for which to get choices. Default empty string (main field).
	 * @return array Array of choices.
	 */
	public function get_choices_for_field( $element, $field = '' );
}