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diff --git a/projects/net.wotonomy.foundation/src/main/java/net/wotonomy/foundation/NSSet.java b/projects/net.wotonomy.foundation/src/main/java/net/wotonomy/foundation/NSSet.java
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+++ b/projects/net.wotonomy.foundation/src/main/java/net/wotonomy/foundation/NSSet.java
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+/*
+Wotonomy: OpenStep design patterns for pure Java applications.
+Copyright (C) 2000 Blacksmith, Inc.
+
+This library is free software; you can redistribute it and/or
+modify it under the terms of the GNU Lesser General Public
+License as published by the Free Software Foundation; either
+version 2.1 of the License, or (at your option) any later version.
+
+This library 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
+Lesser General Public License for more details.
+
+You should have received a copy of the GNU Lesser General Public
+License along with this library; if not, see http://www.gnu.org
+*/
+
+package net.wotonomy.foundation;
+
+import java.util.Collection;
+import java.util.Enumeration;
+import java.util.HashSet;
+import java.util.Iterator;
+import java.util.Set;
+import java.util.Vector;
+
+/**
+* A pure java implementation of NSSet that
+* implements Set for greater java interoperability.
+*
+* @author michael@mpowers.net
+* @author $Author: cgruber $
+* @version $Revision: 893 $
+*/
+public class NSSet extends HashSet
+{
+    /**
+    * Default constructor.
+    */
+    public NSSet ()
+    {
+        super();
+    }
+
+    /**
+    * Constructs a NSSet containing the objects
+    * in the specified collection.
+    */
+    public NSSet ( Collection aCollection )
+    {
+        super( aCollection );
+    }
+
+    /**
+    * Constructs a NSSet containing only
+    * the specified object.
+    */
+    public NSSet ( Object anObject )
+    {
+        super();
+        add( anObject );
+    }
+
+    /**
+    * Constructs a NSSet containing the objects
+    * in the specified array.
+    */
+    public NSSet ( Object[] anObjectArray )
+    {
+        super();
+        for ( int i = 0; i < anObjectArray.length; i++ )
+        {
+            add( anObjectArray[i] );
+        }
+    }
+
+    /**
+    * Returns an NSArray containing all objects in the set.
+    */
+    public NSArray allObjects ()
+    {
+        return new NSArray( this );
+    }
+
+    /**
+    * 
+    */
+    public Object anyObject ()
+    {
+        throw new RuntimeException( "Not implemented yet." );
+    }
+
+    /**
+    * Returns whether this set contains the
+    * specified object.
+    */
+    public boolean containsObject ( Object anObject )
+    {
+        return contains( anObject );
+    }
+
+    /**
+    * Returns the number of elements in this set.
+    */
+    public int count ()
+    {
+        return size();
+    }
+
+    /**
+    * Returns whether this set has one or more
+    * elements in common with the specified set.
+    */
+    public boolean intersectsSet ( Set aSet )
+    {
+        Iterator it = aSet.iterator();
+        while ( it.hasNext() )
+        {
+            if ( this.containsObject( it.next() ) )
+            {
+                return true;
+            }
+        } 
+        return false;
+        
+    }
+
+    /**
+    * Returns whether this set contains the
+    * same object as the specified set.
+    */
+    public boolean isEqualToSet ( Set aSet )
+    {
+        return equals( aSet );
+    }
+
+    /**
+    * Returns whether this set is a subset
+    * of the specified set.
+    */
+    public boolean isSubsetOfSet ( Set aSet )
+    {
+        return aSet.containsAll( this );
+    }
+
+    /**
+    * 
+    */
+    public Object member ( Object anObject )
+    {
+        throw new RuntimeException( "Not implemented yet." );
+    }
+
+    /**
+    * Returns an enumerator over the objects
+    * in this set.
+    */
+    public Enumeration objectEnumerator ()
+    {
+        return new Vector( this ).elements();
+    }
+
+    /**
+    * Returns a set that is the intersection
+    * of this set and the specified set.
+    */
+    public NSSet setByIntersectingSet ( Set aSet )
+    {
+        NSSet result = new NSSet( this );
+        result.retainAll( aSet );
+        return result;
+    }
+
+    /**
+    * Returns a set that contains all elements
+    * in this set that are not in the specified set.
+    */
+    public NSSet setBySubtractingSet ( Set aSet )
+    {
+        NSSet result = new NSSet( this );
+        result.removeAll( aSet );
+        return result;
+    }
+
+    /**
+    * Returns a set that is the union
+    * of this set and the specified set.
+    */
+    public NSSet setByUnioningSet ( Set aSet )
+    {
+        NSSet result = new NSSet( this );
+        result.addAll( aSet );
+        return result;
+    }
+		
+}
+
+/*
+ * $Log$
+ * Revision 1.2  2006/02/16 13:15:00  cgruber
+ * Check in all sources in eclipse-friendly maven-enabled packages.
+ *
+ * Revision 1.1.1.1  2000/12/21 15:47:45  mpowers
+ * Contributing wotonomy.
+ *
+ * Revision 1.3  2000/12/20 16:25:39  michael
+ * Added log to all files.
+ *
+ *
+ */
+