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diff --git a/includes/revisiondelete/RevDelItem.php b/includes/revisiondelete/RevDelItem.php
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+++ b/includes/revisiondelete/RevDelItem.php
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+<?php
+/**
+ * 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
+ * @ingroup RevisionDelete
+ */
+
+/**
+ * Abstract base class for deletable items
+ */
+abstract class RevDelItem extends RevisionItemBase {
+	/**
+	 * Returns true if the item is "current", and the operation to set the given
+	 * bits can't be executed for that reason
+	 * STUB
+	 * @param int $newBits
+	 * @return bool
+	 */
+	public function isHideCurrentOp( $newBits ) {
+		return false;
+	}
+
+	/**
+	 * Get the current deletion bitfield value
+	 */
+	abstract public function getBits();
+
+	/**
+	 * Set the visibility of the item. This should do any necessary DB queries.
+	 *
+	 * The DB update query should have a condition which forces it to only update
+	 * if the value in the DB matches the value fetched earlier with the SELECT.
+	 * If the update fails because it did not match, the function should return
+	 * false. This prevents concurrency problems.
+	 *
+	 * @param int $newBits
+	 * @return bool Success
+	 */
+	abstract public function setBits( $newBits );
+
+	/**
+	 * Get the return information about the revision for the API
+	 * @since 1.23
+	 * @param ApiResult $result API result object
+	 * @return array Data for the API result
+	 */
+	abstract public function getApiData( ApiResult $result );
+}