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diff --git a/java/org/odmg/DBag.java b/java/org/odmg/DBag.java
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+/*
+* This file is part of rasdaman community.
+*
+* Rasdaman community 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.
+*
+* Rasdaman community 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 rasdaman community.  If not, see <http://www.gnu.org/licenses/>.
+*
+* Copyright 2003, 2004, 2005, 2006, 2007, 2008, 2009 Peter Baumann /
+rasdaman GmbH.
+*
+* For more information please see <http://www.rasdaman.org>
+* or contact Peter Baumann via <baumann@rasdaman.com>.
+*/
+package org.odmg;
+
+/**
+* This interface defines the operations associated with an ODMG bag collection.
+* All of the operations defined by the JavaSoft <code>Collection</code>
+* interface are supported by an ODMG implementation of <code>DBag</code>,
+* the exception <code>UnsupportedOperationException</code> is not thrown when a
+* call is made to any of the <code>Collection</code> methods.
+* @author	David Jordan (as Java Editor of the Object Data Management Group)
+* @version ODMG 3.0
+*/
+// * @see java.lang.UnsupportedOperationException
+
+public interface DBag extends DCollection
+{
+/**
+* A new <code>DBag</code> instance is created that is the union of this object
+* and <code>otherBag</code>.
+* This method is similar to the <code>addAll</code> method in <code>Collection</code>,
+* except that this method creates a new collection and <code>addAll</code>
+* modifies the object to contain the result.
+* @param	otherBag	The other bag to use in the union operation.
+* @return A <code>DBag</code> instance that contains the union of this object
+* and <code>otherBag</code>.
+*/
+// * @see	com.sun.java.util.collections.Collection#addAll
+	public	DBag	union(DBag otherBag);
+
+/**
+* A new <code>DBag</code> instance is created that contains the intersection of
+* this object and the <code>DBag</code> referenced by <code>otherBag</code>.
+* This method is similar to the <code>retainAll</code> method in <code>Collection</code>,
+* except that this method creates a new collection and <code>retainAll</code>
+* modifies the object to contain the result.
+* @param	otherBag The other bag to use in creating the intersection.
+* @return A <code>DBag</code> instance that contains the intersection of this
+* object and <code>otherBag</code>.
+*/
+// @see com.sun.java.util.collections.Collection#retainAll
+	public	DBag	intersection(DBag otherBag);
+
+/**
+* A new <code>DBag</code> instance is created that contains the difference of
+* this object and the <code>DBag</code> instance referenced by <code>otherBag</code>.
+* This method is similar to the <code>removeAll</code> method in <code>Collection</code>,
+* except that this method creates a new collection and <code>removeAll</code>
+* modifies the object to contain the result.
+* @param	otherBag The other bag to use in creating the difference.
+* @return A <code>DBag</code> instance that contains the elements of this object
+* minus the elements in <code>otherBag</code>.
+*/
+// * @see com.sun.java.util.collections.Collection#removeAll
+	public	DBag	difference(DBag otherBag);
+
+/**
+* This method returns the number of occurrences of the object <code>obj</code>
+* in the <code>DBag</code> collection.
+* @param obj The value that may have elements in the collection.
+* @return The number of occurrences of <code>obj</code> in this collection.
+*/
+	public	int		occurrences(Object obj);
+}
+