function bp_email_get_type_schema( $field = 'description' ) {
	$activity_comment = array(
		'description'	=> __( 'A member has replied to an activity update that the recipient posted.', 'buddypress' ),
		'unsubscribe'	=> array(
			'meta_key'	=> 'notification_activity_new_reply',
			'message'	=> __( 'You will no longer receive emails when someone replies to an update or comment you posted.', 'buddypress' ),
			),
	);

	$activity_comment_author = array(
		'description'	=> __( 'A member has replied to a comment on an activity update that the recipient posted.', 'buddypress' ),
		'unsubscribe'	=> array(
			'meta_key'	=> 'notification_activity_new_reply',
			'message'	=> __( 'You will no longer receive emails when someone replies to an update or comment you posted.', 'buddypress' ),
			),
	);

	$activity_at_message = array(
		'description'	=> __( 'Recipient was mentioned in an activity update.', 'buddypress' ),
		'unsubscribe'	=> array(
			'meta_key'	=> 'notification_activity_new_mention',
			'message'	=> __( 'You will no longer receive emails when someone mentions you in an update.', 'buddypress' ),
		),
	);

	$groups_at_message = array(
		'description'	=> __( 'Recipient was mentioned in a group activity update.', 'buddypress' ),
		'unsubscribe'	=> array(
			'meta_key'	=> 'notification_activity_new_mention',
			'message'	=> __( 'You will no longer receive emails when someone mentions you in an update.', 'buddypress' ),
		),
	);

	$core_user_registration = array(
		'description'	=> __( 'Recipient has registered for an account.', 'buddypress' ),
		'unsubscribe'	=> false,
	);

	$core_user_registration_with_blog = array(
		'description'	=> __( 'Recipient has registered for an account and site.', 'buddypress' ),
		'unsubscribe'	=> false,
	);

	$friends_request = array(
		'description'	=> __( 'A member has sent a friend request to the recipient.', 'buddypress' ),
		'unsubscribe'	=> array(
			'meta_key'	=> 'notification_friends_friendship_request',
			'message'	=> __( 'You will no longer receive emails when someone sends you a friend request.', 'buddypress' ),
		),
	);

	$friends_request_accepted = array(
		'description'	=> __( 'Recipient has had a friend request accepted by a member.', 'buddypress' ),
		'unsubscribe'	=> array(
			'meta_key'	=> 'notification_friends_friendship_accepted',
			'message'	=> __( 'You will no longer receive emails when someone accepts your friendship request.', 'buddypress' ),
		),
	);

	$groups_details_updated = array(
		'description'	=> __( "A group's details were updated.", 'buddypress' ),
		'unsubscribe'	=> array(
			'meta_key'	=> 'notification_groups_group_updated',
			'message'	=> __( 'You will no longer receive emails when one of your groups is updated.', 'buddypress' ),
		),
	);

	$groups_invitation = array(
		'description'	=> __( 'A member has sent a group invitation to the recipient.', 'buddypress' ),
		'unsubscribe'	=> array(
			'meta_key'	=> 'notification_groups_invite',
			'message'	=> __( 'You will no longer receive emails when you are invited to join a group.', 'buddypress' ),
		),
	);

	$groups_member_promoted = array(
		'description'	=> __( "Recipient's status within a group has changed.", 'buddypress' ),
		'unsubscribe'	=> array(
			'meta_key'	=> 'notification_groups_admin_promotion',
			'message'	=> __( 'You will no longer receive emails when you have been promoted in a group.', 'buddypress' ),
		),
	);

	$groups_membership_request = array(
		'description'	=> __( 'A member has requested permission to join a group.', 'buddypress' ),
		'unsubscribe'	=> array(
			'meta_key'	=> 'notification_groups_membership_request',
			'message'	=> __( 'You will no longer receive emails when someone requests to be a member of your group.', 'buddypress' ),
		),
	);

	$messages_unread = array(
		'description'	=> __( 'Recipient has received a private message.', 'buddypress' ),
		'unsubscribe'	=> array(
			'meta_key'	=> 'notification_messages_new_message',
			'message'	=> __( 'You will no longer receive emails when someone sends you a message.', 'buddypress' ),
		),
	);

	$settings_verify_email_change = array(
		'description'	=> __( 'Recipient has changed their email address.', 'buddypress' ),
		'unsubscribe'	=> false,
	);

	$groups_membership_request_accepted = array(
		'description'	=> __( 'Recipient had requested to join a group, which was accepted.', 'buddypress' ),
		'unsubscribe'	=> array(
			'meta_key'	=> 'notification_membership_request_completed',
			'message'	=> __( 'You will no longer receive emails when your request to join a group has been accepted or denied.', 'buddypress' ),
		),
	);

	$groups_membership_request_rejected = array(
		'description'	=> __( 'Recipient had requested to join a group, which was rejected.', 'buddypress' ),
		'unsubscribe'	=> array(
			'meta_key'	=> 'notification_membership_request_completed',
			'message'	=> __( 'You will no longer receive emails when your request to join a group has been accepted or denied.', 'buddypress' ),
		),
	);

	$types = array(
		'activity-comment'                   => $activity_comment,
		'activity-comment-author'            => $activity_comment_author,
		'activity-at-message'                => $activity_at_message,
		'groups-at-message'                  => $groups_at_message,
		'core-user-registration'             => $core_user_registration,
		'core-user-registration-with-blog'   => $core_user_registration_with_blog,
		'friends-request'                    => $friends_request,
		'friends-request-accepted'           => $friends_request_accepted,
		'groups-details-updated'             => $groups_details_updated,
		'groups-invitation'                  => $groups_invitation,
		'groups-member-promoted'             => $groups_member_promoted,
		'groups-membership-request'          => $groups_membership_request,
		'messages-unread'                    => $messages_unread,
		'settings-verify-email-change'       => $settings_verify_email_change,
		'groups-membership-request-accepted' => $groups_membership_request_accepted,
		'groups-membership-request-rejected' => $groups_membership_request_rejected,
	);

	if ( $field !== 'all' ) {
		return wp_list_pluck( $types, $field );
	} else {
		return $types;
	}
}