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diff --git a/projects/net.wotonomy.persistence/src/main/java/net/wotonomy/control/EORelationshipManipulation.java b/projects/net.wotonomy.persistence/src/main/java/net/wotonomy/control/EORelationshipManipulation.java
new file mode 100644
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+++ b/projects/net.wotonomy.persistence/src/main/java/net/wotonomy/control/EORelationshipManipulation.java
@@ -0,0 +1,76 @@
+/*
+Wotonomy: OpenStep design patterns for pure Java applications.
+Copyright (C) 2001 Michael Powers
+
+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.control;
+
+/**
+* EORelationshipManipulation provides methods for generically
+* adding and removing relationships between objects, handling
+* both one-way and reciprocal relationships.
+*
+* @author michael@mpowers.net
+* @author $Author: cgruber $
+* @version $Revision: 893 $
+*/
+public interface EORelationshipManipulation 
+{
+    /**
+    * Adds the specified object to the relationship on this
+    * object specified by the key.  For to-one relationships,
+    * this operation is the same as valueForKey.
+    */
+    void addObjectToPropertyWithKey( 
+        Object anObject, String aKey );
+
+    /**
+    * Removes the specified object from the relationship on
+    * this object specified by the key.  For to-one relationships,
+    * this operation is the same as takeValueForKey with a null
+    * value.
+    */
+    void removeObjectFromPropertyWithKey( 
+        Object anObject, String aKey );
+
+    /**
+    * As addObjectToProperty with key, but also performs the
+    * reciprocal operation on the other side of the relationship.
+    */
+    void addObjectToBothSidesOfRelationshipWithKey( 
+        EORelationshipManipulation anObject, String aKey );
+        
+    /**
+    * As removeObjectFromPropertyWithKey with key, but also performs the
+    * reciprocal operation on the other side of the relationship.
+    */
+    void removeObjectFromBothSidesOfRelationshipWithKey( 
+        EORelationshipManipulation anObject, String aKey );
+
+}
+
+/*
+ * $Log$
+ * Revision 1.1  2006/02/16 13:19:57  cgruber
+ * Check in all sources in eclipse-friendly maven-enabled packages.
+ *
+ * Revision 1.1  2001/11/13 04:13:59  mpowers
+ * Added interfaces needed to begin work on EOCustomObject.
+ *
+ *
+ */
+    
+