WP_REST_Blocks_Controller::get_item_schema

		// Do not cache this schema because all properties are derived from parent controller.
		$schema = parent::get_item_schema();

		/*
		 * Allow all contexts to access `title.raw` and `content.raw`. Clients always
		 * need the raw markup of a reusable block to do anything useful, e.g. parse
		 * it or display it in an editor.
		 */
		$schema['properties']['title']['properties']['raw']['context']   = array( 'view', 'edit' );
		$schema['properties']['content']['properties']['raw']['context'] = array( 'view', 'edit' );

		/*
		 * Remove `title.rendered` and `content.rendered` from the schema. It doesn’t
		 * make sense for a reusable block to have rendered content on its own, since
		 * rendering a block requires it to be inside a post or a page.
		 */
		unset( $schema['properties']['title']['properties']['rendered'] );
		unset( $schema['properties']['content']['properties']['rendered'] );

		return $schema;
	}