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diff --git a/www/wiki/includes/XmlJsCode.php b/www/wiki/includes/XmlJsCode.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
+ */
+
+/**
+ * A wrapper class which causes Xml::encodeJsVar() and Xml::encodeJsCall() to
+ * interpret a given string as being a JavaScript expression, instead of string
+ * data.
+ *
+ * @par Example:
+ * @code
+ *     Xml::encodeJsVar( new XmlJsCode( 'a + b' ) );
+ * @endcode
+ *
+ * This returns "a + b".
+ *
+ * @note As of 1.21, XmlJsCode objects cannot be nested inside objects or arrays. The sole
+ *       exception is the $args argument to Xml::encodeJsCall() because Xml::encodeJsVar() is
+ *       called for each individual element in that array.
+ *
+ * @since 1.17
+ */
+class XmlJsCode {
+	public $value;
+
+	function __construct( $value ) {
+		$this->value = $value;
+	}
+}