khaihihi

wp-content/plugins/wordpress-seo/frontend/schema/interface-wpseo-graph-piece.php

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+<?php
+/**
+ * WPSEO plugin file.
+ *
+ * @package WPSEO\Frontend\Schema
+ */
+
+if ( ! interface_exists( 'WPSEO_Graph_Piece' ) ) {
+	/**
+	 * An interface for registering Schema Graph Pieces.
+	 *
+	 * @since 10.2
+	 */
+	interface WPSEO_Graph_Piece {
+
+		/**
+		 * Add your piece of the graph.
+		 *
+		 * @return array|bool $graph A graph piece on success, false on failure.
+		 */
+		public function generate();
+
+		/**
+		 * Determines whether or not a piece should be added to the graph.
+		 *
+		 * @return bool
+		 */
+		public function is_needed();
+	}
+}