晋太元中，武陵人捕鱼为业。缘溪行，忘路之远近。忽逢桃花林，夹岸数百步，中无杂树，芳草鲜美，落英缤纷。渔人甚异之，复前行，欲穷其林。 　　林尽水源，便得一山，山有小口，仿佛若有光。便舍船，从口入。初极狭，才通人。复行数十步，豁然开朗。土地平旷，屋舍俨然，有良田、美池、桑竹之属。阡陌交通，鸡犬相闻。其中往来种作，男女衣着，悉如外人。黄发垂髫，并怡然自乐。 　　见渔人，乃大惊，问所从来。具答之。便要还家，设酒杀鸡作食。村中闻有此人，咸来问讯。自云先世避秦时乱，率妻子邑人来此绝境，不复出焉，遂与外人间隔。问今是何世，乃不知有汉，无论魏晋。此人一一为具言所闻，皆叹惋。余人各复延至其家，皆出酒食。停数日，辞去。此中人语云：“不足为外人道也。”(间隔 一作：隔绝) 　　既出，得其船，便扶向路，处处志之。及郡下，诣太守，说如此。太守即遣人随其往，寻向所志，遂迷，不复得路。 　　南阳刘子骥，高尚士也，闻之，欣然规往。未果，寻病终。后遂无问津者。 .
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Current File : /home/tabatabaei/www/wp-includes/sitemaps.php
<?php
/**
 * Sitemaps: Public functions
 *
 * This file contains a variety of public functions developers can use to interact with
 * the XML Sitemaps API.
 *
 * @package WordPress
 * @subpackage Sitemaps
 * @since 5.5.0
 */

/**
 * Retrieves the current Sitemaps server instance.
 *
 * @since 5.5.0
 *
 * @global WP_Sitemaps $wp_sitemaps Global Core Sitemaps instance.
 *
 * @return WP_Sitemaps Sitemaps instance.
 */
function wp_sitemaps_get_server() {
	global $wp_sitemaps;

	// If there isn't a global instance, set and bootstrap the sitemaps system.
	if ( empty( $wp_sitemaps ) ) {
		$wp_sitemaps = new WP_Sitemaps();
		$wp_sitemaps->init();

		/**
		 * Fires when initializing the Sitemaps object.
		 *
		 * Additional sitemaps should be registered on this hook.
		 *
		 * @since 5.5.0
		 *
		 * @param WP_Sitemaps $wp_sitemaps Sitemaps object.
		 */
		do_action( 'wp_sitemaps_init', $wp_sitemaps );
	}

	return $wp_sitemaps;
}

/**
 * Gets an array of sitemap providers.
 *
 * @since 5.5.0
 *
 * @return WP_Sitemaps_Provider[] Array of sitemap providers.
 */
function wp_get_sitemap_providers() {
	$sitemaps = wp_sitemaps_get_server();

	return $sitemaps->registry->get_providers();
}

/**
 * Registers a new sitemap provider.
 *
 * @since 5.5.0
 *
 * @param string               $name     Unique name for the sitemap provider.
 * @param WP_Sitemaps_Provider $provider The `Sitemaps_Provider` instance implementing the sitemap.
 * @return bool Whether the sitemap was added.
 */
function wp_register_sitemap_provider( $name, WP_Sitemaps_Provider $provider ) {
	$sitemaps = wp_sitemaps_get_server();

	return $sitemaps->registry->add_provider( $name, $provider );
}

/**
 * Gets the maximum number of URLs for a sitemap.
 *
 * @since 5.5.0
 *
 * @param string $object_type Object type for sitemap to be filtered (e.g. 'post', 'term', 'user').
 * @return int The maximum number of URLs.
 */
function wp_sitemaps_get_max_urls( $object_type ) {
	/**
	 * Filters the maximum number of URLs displayed on a sitemap.
	 *
	 * @since 5.5.0
	 *
	 * @param int    $max_urls    The maximum number of URLs included in a sitemap. Default 2000.
	 * @param string $object_type Object type for sitemap to be filtered (e.g. 'post', 'term', 'user').
	 */
	return apply_filters( 'wp_sitemaps_max_urls', 2000, $object_type );
}

/**
 * Retrieves the full URL for a sitemap.
 *
 * @since 5.5.1
 *
 * @param string $name         The sitemap name.
 * @param string $subtype_name The sitemap subtype name. Default empty string.
 * @param int    $page         The page of the sitemap. Default 1.
 * @return string|false The sitemap URL or false if the sitemap doesn't exist.
 */
function get_sitemap_url( $name, $subtype_name = '', $page = 1 ) {
	$sitemaps = wp_sitemaps_get_server();

	if ( ! $sitemaps ) {
		return false;
	}

	if ( 'index' === $name ) {
		return $sitemaps->index->get_index_url();
	}

	$provider = $sitemaps->registry->get_provider( $name );
	if ( ! $provider ) {
		return false;
	}

	if ( $subtype_name && ! in_array( $subtype_name, array_keys( $provider->get_object_subtypes() ), true ) ) {
		return false;
	}

	$page = absint( $page );
	if ( 0 >= $page ) {
		$page = 1;
	}

	return $provider->get_sitemap_url( $subtype_name, $page );
}

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