Edit file File name : interface-sitemap-cache-data.php Content :<?php /** * WPSEO plugin file. * * @package WPSEO\XML_Sitemaps */ /** * Cache Data interface. */ interface WPSEO_Sitemap_Cache_Data_Interface { /** * Status for normal, usable sitemap. * * @var string */ public const OK = 'ok'; /** * Status for unusable sitemap. * * @var string */ public const ERROR = 'error'; /** * Status for unusable sitemap because it cannot be identified. * * @var string */ public const UNKNOWN = 'unknown'; /** * Set the content of the sitemap. * * @param string $sitemap The XML content of the sitemap. * * @return void */ public function set_sitemap( $sitemap ); /** * Set the status of the sitemap. * * @param bool|string $usable True/False or 'ok'/'error' for status. * * @return void */ public function set_status( $usable ); /** * Builds the sitemap. * * @return string The XML content of the sitemap. */ public function get_sitemap(); /** * Get the status of this sitemap. * * @return string Status 'ok', 'error' or 'unknown'. */ public function get_status(); /** * Is the sitemap content usable ? * * @return bool True if the sitemap is usable, False if not. */ public function is_usable(); } Save