public function get_item_schema() {
		$schema = array(
			'$schema'    => 'http://json-schema.org/draft-04/schema#',
			'title'      => 'bp_messages',
			'type'       => 'object',
			'properties' => array(
				'id'                  => array(
					'context'     => array( 'view', 'edit' ),
					'description' => __( 'A unique numeric ID for the Thread.', 'buddypress' ),
					'type'        => 'integer',
				),
				'message_id'          => array(
					'context'     => array( 'view', 'edit' ),
					'description' => __( 'The ID of the latest message of the Thread.', 'buddypress' ),
					'readonly'    => true,
					'type'        => 'integer',
				),
				'last_sender_id'      => array(
					'context'     => array( 'view', 'edit' ),
					'description' => __( 'The ID of latest sender of the Thread.', 'buddypress' ),
					'readonly'    => true,
					'type'        => 'integer',
				),
				'subject'             => array(
					'context'     => array( 'view', 'edit' ),
					'description' => __( 'Title of the latest message of the Thread.', 'buddypress' ),
					'type'        => 'object',
					'arg_options' => array(
						'sanitize_callback' => null,
						'validate_callback' => null,
					),
					'properties'  => array(
						'raw'      => array(
							'description' => __( 'Title of the latest message of the Thread, as it exists in the database.', 'buddypress' ),
							'type'        => 'string',
							'context'     => array( 'edit' ),
							'default'     => false,
						),
						'rendered' => array(
							'description' => __( 'Title of the latest message of the Thread, transformed for display.', 'buddypress' ),
							'type'        => 'string',
							'context'     => array( 'view', 'edit' ),
							'readonly'    => true,
							'default'     => false,
						),
					),
				),
				'excerpt'             => array(
					'context'     => array( 'view', 'edit' ),
					'description' => __( 'Summary of the latest message of the Thread.', 'buddypress' ),
					'type'        => 'object',
					'readonly'    => true,
					'arg_options' => array(
						'sanitize_callback' => null,
						'validate_callback' => null,
					),
					'properties'  => array(
						'raw'      => array(
							'description' => __( 'Summary for the latest message of the Thread, as it exists in the database.', 'buddypress' ),
							'type'        => 'string',
							'context'     => array( 'edit' ),
						),
						'rendered' => array(
							'description' => __( 'HTML summary for the latest message of the Thread, transformed for display.', 'buddypress' ),
							'type'        => 'string',
							'context'     => array( 'view', 'edit' ),
						),
					),
				),
				'message'             => array(
					'context'     => array( 'view', 'edit' ),
					'description' => __( 'Content of the latest message of the Thread.', 'buddypress' ),
					'type'        => 'object',
					'required'    => true,
					'arg_options' => array(
						'sanitize_callback' => null,
						'validate_callback' => null,
					),
					'properties'  => array(
						'raw'      => array(
							'description' => __( 'Content for the latest message of the Thread, as it exists in the database.', 'buddypress' ),
							'type'        => 'string',
							'context'     => array( 'edit' ),
						),
						'rendered' => array(
							'description' => __( 'HTML content for the latest message of the Thread, transformed for display.', 'buddypress' ),
							'type'        => 'string',
							'context'     => array( 'view', 'edit' ),
							'readonly'    => true,
						),
					),
				),
				'date'                => array(
					'context'     => array( 'view', 'edit' ),
					'description' => __( "The date the latest message of the Thread, in the site's timezone.", 'buddypress' ),
					'readonly'    => true,
					'type'        => 'string',
					'format'      => 'date-time',
				),
				'unread_count'        => array(
					'context'     => array( 'view', 'edit' ),
					'description' => __( 'Total count of unread messages into the Thread for the requested user.', 'buddypress' ),
					'readonly'    => true,
					'type'        => 'integer',
				),
				'sender_ids'          => array(
					'context'     => array( 'view', 'edit' ),
					'description' => __( 'The list of user IDs for all messages in the Thread.', 'buddypress' ),
					'readonly'    => true,
					'type'        => 'array',
					'items'       => array(
						'type' => 'integer',
					),
				),
				'recipients'          => array(
					'context'     => array( 'view', 'edit' ),
					'description' => __( 'The list of recipient User Objects involved into the Thread.', 'buddypress' ),
					'type'        => 'array',
					'items'       => array(
						'type' => 'object',
					),
				),
				'messages'            => array(
					'context'     => array( 'view', 'edit' ),
					'description' => __( 'List of message objects for the thread.', 'buddypress' ),
					'readonly'    => true,
					'type'        => 'array',
					'items'       => array(
						'type' => 'object',
					),
				),
				'starred_message_ids' => array(
					'context'     => array( 'view', 'edit' ),
					'description' => __( 'List of starred message IDs.', 'buddypress' ),
					'readonly'    => true,
					'type'        => 'array',
					'items'       => array(
						'type' => 'integer',
					),
					'default'     => array(),
				),
			),
		);

		/**
		 * Filters the message schema.
		 *
		 * @since 5.0.0
		 *
		 * @param array $schema The endpoint schema.
		 */
		return apply_filters( 'bp_rest_message_schema', $this->add_additional_fields_schema( $schema ) );
	}