diff -u -r1.7 -r1.8
--- ExpandedIdentifier.java	28 Aug 2007 22:25:46 -0000	1.7
+++ ExpandedIdentifier.java	25 Sep 2007 23:43:36 -0000	1.8
@@ -7,7 +7,7 @@

  * Implementation of {@link IExpandedIdentifier}.
  *
  * @author Jeremy McCormick

- * @version $Id: ExpandedIdentifier.java,v 1.7 2007/08/28 22:25:46 jeremy Exp $

+ * @version $Id: ExpandedIdentifier.java,v 1.8 2007/09/25 23:43:36 jeremy Exp $

  */
 
 public class ExpandedIdentifier

@@ -18,6 +18,21 @@

     public ExpandedIdentifier()
     {}
     

+    public ExpandedIdentifier(IExpandedIdentifier id)
+    {
+    	values.addAll(id.getValues());
+    }
+    
+    public ExpandedIdentifier(ExpandedIdentifier id)
+    {
+    	values.addAll(id.getValues());
+    }
+    
+    public ExpandedIdentifier copy()
+    {
+    	return new ExpandedIdentifier(this);
+    }
+    

     public ExpandedIdentifier( int reserve )
     {
     	if (reserve > 64)

diff -u -r1.6 -r1.7
--- Identifier.java	28 Aug 2007 03:22:27 -0000	1.6
+++ Identifier.java	25 Sep 2007 23:43:36 -0000	1.7
@@ -1,30 +1,37 @@

-/**
- * File:    Identifier.java
- * Created: Apr 30, 2007 4:16:59 PM
- * 
- * Implementation of {@link IIdentifier}.
- *
- * @author Jeremy McCormick
- * @version $Id: Identifier.java,v 1.6 2007/08/28 03:22:27 jeremy Exp $
- */

 package org.lcsim.detector.identifier;
 
 /**
  * Implementation of {@link IIdentifier}.
  * 
  * @author Jeremy McCormick

- * @version $Id: Identifier.java,v 1.6 2007/08/28 03:22:27 jeremy Exp $

+ * @version $Id: Identifier.java,v 1.7 2007/09/25 23:43:36 jeremy Exp $

  */
 public class Identifier
 implements IIdentifier
 {    

-    long value = unsetValue;
-    private static final long unsetValue = 0;
-    boolean valid=false;

+    long value;
+    boolean valid = false;

     
     public Identifier()
     {}
     

+    public Identifier(IIdentifier id)
+    {
+    	value = id.getValue();
+    	valid = id.isValid();
+    }
+    
+    public Identifier(Identifier id)
+    {
+    	value = id.getValue();
+    	valid = id.isValid();
+    }
+    
+    public Identifier copy()
+    {
+    	return new Identifier(this);
+    }
+    

     public Identifier(long value)
     {
         setValue(value);

@@ -48,7 +55,7 @@

     
     public void clear()
     {

-         value = unsetValue;

+         value = 0;

          valid = false;
     }