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diff --git a/www/wiki/includes/user/UserIdentity.php b/www/wiki/includes/user/UserIdentity.php
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+<?php
+/**
+ * Interface for objects representing user identity.
+ *
+ * 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
+ */
+
+namespace MediaWiki\User;
+
+/**
+ * Interface for objects representing user identity.
+ *
+ * This represents the identity of a user in the context of page revisions and log entries.
+ *
+ * @since 1.31
+ */
+interface UserIdentity {
+
+	/**
+	 * @since 1.31
+	 *
+	 * @return int The user ID. May be 0 for anonymous users or for users with no local account.
+	 */
+	public function getId();
+
+	/**
+	 * @since 1.31
+	 *
+	 * @return string The user's logical name. May be an IPv4 or IPv6 address for anonymous users.
+	 */
+	public function getName();
+
+	/**
+	 * @since 1.31
+	 *
+	 * @return int The user's actor ID. May be 0 if no actor ID is set.
+	 */
+	public function getActorId();
+
+	// TODO: we may want to (optionally?) provide a global ID, see CentralIdLookup.
+
+}