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diff --git a/application/shipsimu/interfaces/class_TradeableItem.php b/application/shipsimu/interfaces/class_TradeableItem.php
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+<?php
+/**
+ * An interface for tradeable items
+ *
+ * @author		Roland Haeder <webmaster@shipsimu.org>
+ * @version		0.0.0
+ * @copyright	Copyright (c) 2007, 2008 Roland Haeder, 2009 Ship-Simu Developer Team
+ * @license		GNU GPL 3.0 or any newer version
+ * @link		http://www.shipsimu.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 3 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, see <http://www.gnu.org/licenses/>.
+ */
+interface TradeableItem extends FrameworkInterface {
+	/**
+	 * Is this item (=object) tradeable?
+	 *
+	 * @return	boolean	true  = is a tradeable object,
+	 *					false = is not tradeable
+	 */
+	function isTradeable ();
+}
+
+// [EOF]
+?>