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/rainic/www/wp-includesTZh/sitemaps/class-wp-sitemaps-registry.php
<?php
/**
 * Sitemaps: WP_Sitemaps_Registry class
 *
 * Handles registering sitemap providers.
 *
 * @package WordPress
 * @subpackage Sitemaps
 * @since 5.5.0
 */

/**
 * Class WP_Sitemaps_Registry.
 *
 * @since 5.5.0
 */
#[AllowDynamicProperties]
class WP_Sitemaps_Registry {
	/**
	 * Registered sitemap providers.
	 *
	 * @since 5.5.0
	 *
	 * @var WP_Sitemaps_Provider[] Array of registered sitemap providers.
	 */
	private $providers = array();

	/**
	 * Adds a new sitemap provider.
	 *
	 * @since 5.5.0
	 *
	 * @param string               $name     Name of the sitemap provider.
	 * @param WP_Sitemaps_Provider $provider Instance of a WP_Sitemaps_Provider.
	 * @return bool Whether the provider was added successfully.
	 */
	public function add_provider( $name, WP_Sitemaps_Provider $provider ) {
		if ( isset( $this->providers[ $name ] ) ) {
			return false;
		}

		/**
		 * Filters the sitemap provider before it is added.
		 *
		 * @since 5.5.0
		 *
		 * @param WP_Sitemaps_Provider $provider Instance of a WP_Sitemaps_Provider.
		 * @param string               $name     Name of the sitemap provider.
		 */
		$provider = apply_filters( 'wp_sitemaps_add_provider', $provider, $name );
		if ( ! $provider instanceof WP_Sitemaps_Provider ) {
			return false;
		}

		$this->providers[ $name ] = $provider;

		return true;
	}

	/**
	 * Returns a single registered sitemap provider.
	 *
	 * @since 5.5.0
	 *
	 * @param string $name Sitemap provider name.
	 * @return WP_Sitemaps_Provider|null Sitemap provider if it exists, null otherwise.
	 */
	public function get_provider( $name ) {
		if ( ! is_string( $name ) || ! isset( $this->providers[ $name ] ) ) {
			return null;
		}

		return $this->providers[ $name ];
	}

	/**
	 * Returns all registered sitemap providers.
	 *
	 * @since 5.5.0
	 *
	 * @return WP_Sitemaps_Provider[] Array of sitemap providers.
	 */
	public function get_providers() {
		return $this->providers;
	}
}

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