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diff --git a/java/org/odmg/DBag.java b/java/org/odmg/DBag.java
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--- a/java/org/odmg/DBag.java
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@@ -1,85 +0,0 @@
-/*
-* 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);
-}
-