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diff --git a/src/com/infomatiq/jsi/SpatialIndex.java b/src/com/infomatiq/jsi/SpatialIndex.java
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+//   SpatialIndex.java
+//   Java Spatial Index Library
+//   Copyright (C) 2002 Infomatiq Limited
+//  
+//  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, write to the Free Software
+//  Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
+
+package com.infomatiq.jsi;
+
+import java.util.Properties;
+
+/**
+ * Defines methods that must be implemented by all 
+ * spatial indexes. This includes the RTree and its variants.
+ * 
+ * @author  aled.morris@infomatiq.co.uk
+ * @version 1.0b2
+ */
+public interface SpatialIndex {
+  
+  /**
+   * Initializes any implementation dependent properties
+   * of the spatial index. For example, RTree implementations
+   * will have a NodeSize property.
+   * 
+   * @param props The set of properties used to initialize the spatial index.
+   */
+  public void init(Properties props);
+  
+  /**
+   * Adds a new rectangle to the spatial index
+   * 
+   * @param r  The rectangle to add to the spatial index.
+   * @param id The ID of the rectangle to add to the spatial index.
+   *           The result of adding more than one rectangle with
+   *           the same ID is undefined.
+   */ 
+  public void add(Rectangle r, int id);
+  
+  /**
+   * Deletes a rectangle from the spatial index
+   * 
+   * @param r  The rectangle to delete from the spatial index
+   * @param id The ID of the rectangle to delete from the spatial
+   *           index
+   * 
+   * @return true  if the rectangle was deleted
+   *         false if the rectangle was not found, or the 
+   *               rectangle was found but with a different ID
+   */
+  public boolean delete(Rectangle r, int id);
+   
+  /**
+   * Finds all rectangles that are nearest to the passed rectangle, and calls 
+   * execute() on the passed IntProcedure for each one. 
+   * 
+   * @param p The point for which this method finds the
+   * nearest neighbours.
+   * 
+   * @param ip The IntProcedure whose execute() method is is called
+   * for each nearest neighbour.
+   * 
+   * @param distance The furthest distance away from the rectangle
+   * to search. Rectangles further than this will not be found. 
+   * 
+   * This should be as small as possible to minimise
+   * the search time.
+   *                         
+   * Use Float.POSITIVE_INFINITY to guarantee that the nearest rectangle is found,
+   * no matter how far away, although this will slow down the algorithm.
+   */
+  public void nearest(Point p, IntProcedure v, float distance);
+  
+  /**
+   * Finds all rectangles that intersect the passed rectangle.
+   * 
+   * @param  r The rectangle for which this method finds
+   *           intersecting rectangles.
+   * 
+   * @param ip The IntProcedure whose execute() method is is called
+   *           for each intersecting rectangle.
+   */
+  public void intersects(Rectangle r, IntProcedure ip);  
+
+  /**
+   * Finds all rectangles contained by the passed rectangle.
+   * 
+   * @param r The rectangle for which this method finds
+   *           contained rectangles.
+   * 
+   * @param v The visitor whose visit() method is is called
+   *           for each contained rectangle.
+   */
+  public void contains(Rectangle r, IntProcedure ip); 
+  
+  /**
+   * Returns the number of entries in the spatial index
+   */
+  public int size();
+  
+  
+  /**
+   * Returns the bounds of all the entries in the spatial index,
+   * or null if there are no entries.
+   */
+  public Rectangle getBounds();
+  
+  /**
+   * Returns a string identifying the type of
+   * spatial index, and the version number, 
+   * eg "SimpleIndex-0.1"
+   */
+  public String getVersion();
+  
+}