diff -u -r1.5 -r1.6
--- CylindricalBarrelCalorimeterConverter.java	5 Apr 2007 23:24:21 -0000	1.5
+++ CylindricalBarrelCalorimeterConverter.java	18 Apr 2007 00:05:27 -0000	1.6
@@ -1,6 +1,7 @@

 package org.lcsim.detector.converter.compact;
 
 import org.lcsim.detector.DetectorElement;

+import org.lcsim.detector.IDetectorElement;

 import org.lcsim.detector.ILogicalVolume;
 import org.lcsim.detector.IPhysicalVolume;
 import org.lcsim.detector.IPhysicalVolumeNavigator;

@@ -157,7 +158,7 @@

                     // Path to the PhysicalVolume of this sensor.
                     String sensorPath = "/" + cal.getName() + "/" + layerName + "/" + sliceName;
                      

-                    new DetectorElement(

+                    new CylindricalBarrelCalorimeterSensorLayer(

                             cal.getName() + "_sensor" + sensorNumber, 
                             cal,
                             sensorPath);

@@ -175,4 +176,14 @@

 	{
 		return CylindricalBarrelCalorimeter.class;
 	}

+    
+    class CylindricalBarrelCalorimeterSensorLayer
+    extends DetectorElement
+    {
+        CylindricalBarrelCalorimeterSensorLayer
+        (String name, IDetectorElement parent, String path)
+        {
+            super(name,parent,path);            
+        }
+    }

 }

\ No newline at end of file

diff -u -r1.5 -r1.6
--- CylindricalEndcapCalorimeterConverter.java	5 Apr 2007 23:24:21 -0000	1.5
+++ CylindricalEndcapCalorimeterConverter.java	18 Apr 2007 00:05:27 -0000	1.6
@@ -3,6 +3,7 @@

 import hep.physics.vec.BasicHep3Vector;
 
 import org.lcsim.detector.DetectorElement;

+import org.lcsim.detector.IDetectorElement;

 import org.lcsim.detector.ILogicalVolume;
 import org.lcsim.detector.IPhysicalVolume;
 import org.lcsim.detector.LogicalVolume;

@@ -46,7 +47,8 @@

         double negz = -cal.getZMin() - width;
                
         // DE for positive endcap.

-        DetectorElement endcap = new DetectorElement(cal.getName() + "_positive", detector);        

+        DetectorElement endcap = 
+            new CylindricalEndcapCalorimeterDE(cal.getName() + "_positive", detector);

         endcap.setSupport(cal.getName() + "_positive");
                 
         // DE for negative endcap.

@@ -68,7 +70,8 @@

                     subdet.getSystemID()
             );                         
 

-            reflectedEndcap = new DetectorElement(cal.getName() + "_negative", detector);

+            reflectedEndcap = 
+                new CylindricalEndcapCalorimeterDE(cal.getName() + "_negative", detector);

             reflectedEndcap.setSupport(cal.getName() + "_negative");            
         }
 

@@ -84,7 +87,7 @@

             DetectorElement endcap, 
             DetectorElement reflectedEndcap)
     {

-        int sensorNum=0;        

+        int layerNumber=0;        

 
         for (int i=0; i<cal.getLayering().getNumberOfLayers(); i++)
         {            

@@ -98,8 +101,8 @@

                 {                   
                     // Create the DE for an endcap sensor.
                     String pathName = "/" + cal.getName() + "_positive" + "/" + layerName + "/" + sliceName; 

-                    new DetectorElement(
-                            cal.getName() + "_positive_sensor" + sensorNum, 

+                    new CylindricalEndcapCalorimeterSensorLayer(
+                            cal.getName() + "_positive_layer" + layerNumber, 

                             endcap, 
                             pathName);
                              

@@ -107,14 +110,14 @@

                     if ( reflectedEndcap != null )
                     {
                         pathName = "/" + cal.getName() + "_negative" + "/" + layerName + "/" + sliceName;

-                        new DetectorElement(
-                                cal.getName() + "_negative_sensor" + sensorNum, 

+                        new CylindricalEndcapCalorimeterSensorLayer(
+                                cal.getName() + "_negative_layer" + layerNumber, 

                                 reflectedEndcap,
                                 pathName);                        
                     }
                     
                     // Increment the sensor number.

-                    ++sensorNum;

+                    ++layerNumber;

                 }
             }
         }

@@ -216,9 +219,29 @@

             zLayer += layer.getThickness();
         }                
     }    

-        

+            

     public Class getSubdetectorType()
     {
         return CylindricalEndcapCalorimeter.class;
     }

+    
+    class CylindricalEndcapCalorimeterSensorLayer
+    extends DetectorElement
+    {
+        CylindricalEndcapCalorimeterSensorLayer
+        (String name, IDetectorElement parent, String path)
+        {
+            super(name,parent,path);            
+        }
+    }    
+    
+    class CylindricalEndcapCalorimeterDE
+    extends DetectorElement
+    {
+        CylindricalEndcapCalorimeterDE
+        (String name, IDetectorElement parent)
+        {
+            super(name,parent);            
+        }
+    }    

 }

\ No newline at end of file

diff -u -r1.10 -r1.11
--- DetectorConverter.java	3 Apr 2007 01:45:59 -0000	1.10
+++ DetectorConverter.java	18 Apr 2007 00:05:27 -0000	1.11
@@ -152,8 +152,6 @@

                 trackingLV,
                 world,
                 0);        

-        
-        //new DetectorElement("trackers", detector, "/tracking_region");

     }
 	
 	private IPhysicalVolume buildWorldVolume(Detector detector)

diff -u -r1.6 -r1.7
--- DiskTrackerConverter.java	5 Apr 2007 23:24:21 -0000	1.6
+++ DiskTrackerConverter.java	18 Apr 2007 00:05:27 -0000	1.7
@@ -3,6 +3,7 @@

 import hep.physics.vec.BasicHep3Vector;
 
 import org.lcsim.detector.DetectorElement;

+import org.lcsim.detector.IDetectorElement;

 import org.lcsim.detector.ILogicalVolume;
 import org.lcsim.detector.LogicalVolume;
 import org.lcsim.detector.PhysicalVolume;

@@ -38,13 +39,13 @@

         Layering layering = tracker.getLayering();
         String name = tracker.getName();
 

-        DetectorElement endcapPos = new DetectorElement(name + "_positive");

+        DetectorElement endcapPos = new DiskTrackerDE(name + "_positive");

         endcapPos.setParent(tracker);
 
         DetectorElement endcapNeg=null;
         if ( tracker.getReflect() )
         {

-            endcapNeg = new DetectorElement(name + "_negative");

+            endcapNeg = new DiskTrackerDE(name + "_negative");

             endcapNeg.setParent(tracker);
         }
 

@@ -145,7 +146,7 @@

                 {                    
                     String path = "/tracking_region/" + name + "_positive_layer" +i + "/slice" + j;
 

-                    new DetectorElement(

+                    new DiskTrackerSensorLayer(

                             name + "_positive_sensor" + sensorNum,
                             endcapPos,
                             path);

@@ -153,7 +154,7 @@

                     if ( tracker.getReflect() )
                     {
                         path = "/tracking_region/" + name + "_negative_layer" +i + "/slice" + j;

-                        new DetectorElement(

+                        new DiskTrackerSensorLayer(

                                 name + "_negative_sensor" + sensorNum,
                                 endcapNeg,
                                 path);

@@ -169,4 +170,24 @@

     {
         return DiskTracker.class;
     }

-}

+    
+    class DiskTrackerSensorLayer
+    extends DetectorElement
+    {
+        DiskTrackerSensorLayer
+        (String name, IDetectorElement parent, String path)
+        {
+            super(name,parent,path);            
+        }
+    }
+    
+    class DiskTrackerDE
+    extends DetectorElement
+    {
+        DiskTrackerDE
+        (String name)
+        {
+            super(name);            
+        }
+    }    
+}

\ No newline at end of file

diff -u -r1.3 -r1.4
--- MultiLayerTrackerConverter.java	5 Apr 2007 23:24:21 -0000	1.3
+++ MultiLayerTrackerConverter.java	18 Apr 2007 00:05:27 -0000	1.4
@@ -1,6 +1,7 @@

 package org.lcsim.detector.converter.compact;
 
 import org.lcsim.detector.DetectorElement;

+import org.lcsim.detector.IDetectorElement;

 import org.lcsim.detector.ILogicalVolume;
 import org.lcsim.detector.LogicalVolume;
 import org.lcsim.detector.PhysicalVolume;

@@ -34,7 +35,7 @@

         
         String name = tracker.getName(); 
         

-        int sensorNum=0;

+        int layerNumber=0;

         for (int i=0; i<tracker.getLayering().getNumberOfLayers(); i++)
         {
             Layer layer = layering.getLayer(i);

@@ -98,8 +99,8 @@

                 if ( slice.isSensitive() )
                 {
                     String path = "/tracking_region/" + name + "_layer" +i + "/slice" + j;

-                    new DetectorElement(name + "sensor" + sensorNum, tracker, path);
-                    ++sensorNum;

+                    new MultiLayerTrackerSensorLayer(name + "_layer" + layerNumber, tracker, path);
+                    ++layerNumber;

                 }
                 
                 sliceInnerR += sliceThickness; 

@@ -111,4 +112,14 @@

     {
         return MultiLayerTracker.class;
     }

+    
+    public class MultiLayerTrackerSensorLayer
+    extends DetectorElement
+    {
+        MultiLayerTrackerSensorLayer(String name, IDetectorElement parent, String path)
+        {
+            super(name,parent,path);
+        }
+    }
+    

 }

\ No newline at end of file