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diff --git a/includes/api/ApiSerializable.php b/includes/api/ApiSerializable.php
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+<?php
+/**
+ * Created on Feb 25, 2015
+ *
+ * Copyright © 2015 Brad Jorsch "bjorsch@wikimedia.org"
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along
+ * with this program; if not, write to the Free Software Foundation, Inc.,
+ * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
+ * http://www.gnu.org/copyleft/gpl.html
+ *
+ * @file
+ */
+
+/**
+ * This interface allows for overriding the default conversion applied by
+ * ApiResult::validateValue().
+ *
+ * @note This is currently an informal interface; it need not be explicitly
+ *   implemented, as long as the method is provided. This allows for extension
+ *   code to maintain compatibility with older MediaWiki while still taking
+ *   advantage of this where it exists.
+ *
+ * @ingroup API
+ * @since 1.25
+ */
+interface ApiSerializable {
+	/**
+	 * Return the value to be added to ApiResult in place of this object.
+	 *
+	 * The returned value must not be an object, and must pass
+	 * all checks done by ApiResult::validateValue().
+	 *
+	 * @return mixed
+	 */
+	public function serializeForApiResult();
+}