diff -N HPSMuonCalorimeterConverter.java
--- /dev/null	1 Jan 1970 00:00:00 -0000
+++ HPSMuonCalorimeterConverter.java	24 Jan 2013 22:25:38 -0000	1.1
@@ -0,0 +1,132 @@

+package org.lcsim.detector.converter.compact;
+
+import org.jdom.DataConversionException;
+import org.jdom.Element;
+import org.lcsim.detector.DetectorElement;
+import org.lcsim.detector.ILogicalVolume;
+import org.lcsim.detector.IRotation3D;
+import org.lcsim.detector.ITranslation3D;
+import org.lcsim.detector.LogicalVolume;
+import org.lcsim.detector.PhysicalVolume;
+import org.lcsim.detector.RotationGeant;
+import org.lcsim.detector.Transform3D;
+import org.lcsim.detector.Translation3D;
+import org.lcsim.detector.identifier.ExpandedIdentifier;
+import org.lcsim.detector.identifier.IExpandedIdentifier;
+import org.lcsim.detector.identifier.IIdentifier;
+import org.lcsim.detector.identifier.IIdentifierDictionary;
+import org.lcsim.detector.identifier.IIdentifierHelper;
+import org.lcsim.detector.material.IMaterial;
+import org.lcsim.detector.material.MaterialStore;
+import org.lcsim.detector.solids.Box;
+import org.lcsim.geometry.compact.Detector;
+import org.lcsim.geometry.compact.Subdetector;
+import org.lcsim.geometry.subdetector.HPSMuonCalorimeter;
+
+
+/**
+ * @author jeremym
+ * @version $Id: HPSMuonCalorimeterConverter.java,v 1.1 2013/01/24 22:25:38 jeremy Exp $
+ */
+public class HPSMuonCalorimeterConverter extends AbstractSubdetectorConverter 
+{
+
+    public Class getSubdetectorType() 
+    {
+        return HPSMuonCalorimeter.class;
+    }
+
+    public void convert(Subdetector subdet, Detector detector) 
+    {               
+        
+        IIdentifierHelper helper = subdet.getDetectorElement().getIdentifierHelper();
+        IIdentifierDictionary dict = helper.getIdentifierDictionary();
+                
+        try {
+            Element node = subdet.getNode();
+            String name = node.getAttributeValue("name");
+            ILogicalVolume mother = detector.getWorldVolume().getLogicalVolume();
+
+            for (Object layerObject : node.getChildren("layer")) {
+
+                Element layer = (Element) layerObject;
+                int layerId = layer.getAttribute("id").getIntValue();
+
+                int slice = 1;
+                for (Object boxObject : layer.getChildren("box")) {
+
+                    Element element = (Element) boxObject;
+
+                    double x, y, z, px, py, pz, rx, ry, rz;
+                    x = y = z = px = py = pz = rx = ry = rz = 0.;
+
+                    if (element.getAttribute("x") != null) {
+                        x = element.getAttribute("x").getDoubleValue();
+                    } else {
+                        throw new RuntimeException("x is required.");
+                    }
+                    if (element.getAttribute("y") != null) {
+                        y = element.getAttribute("y").getDoubleValue();
+                    } else {
+                        throw new RuntimeException("y is required.");
+                    }
+                    if (element.getAttribute("z") != null) {
+                        z = element.getAttribute("z").getDoubleValue();
+                    } else {
+                        throw new RuntimeException("z is required.");
+                    }
+
+                    if (element.getAttribute("px") != null)
+                        px = element.getAttribute("px").getDoubleValue();
+                    if (element.getAttribute("py") != null)
+                        py = element.getAttribute("py").getDoubleValue();
+                    if (element.getAttribute("pz") != null)
+                        pz = element.getAttribute("pz").getDoubleValue();
+
+                    if (element.getAttribute("rx") != null)
+                        rx = element.getAttribute("rx").getDoubleValue();
+                    if (element.getAttribute("ry") != null)
+                        ry = element.getAttribute("ry").getDoubleValue();
+                    if (element.getAttribute("rz") != null)
+                        rz = element.getAttribute("rz").getDoubleValue();
+
+                    String materialName = element.getAttributeValue("material");
+                    IMaterial material = MaterialStore.getInstance().get(materialName);
+
+                    String shapeBaseName = name + "_layer" + layerId + "_sublayer" + slice;
+
+                    Box box = new Box(shapeBaseName + "_box", x, y, z);
+
+                    ITranslation3D pos = new Translation3D(px, py, pz);
+                    IRotation3D rot = new RotationGeant(rx, ry, rz);
+                    ILogicalVolume vol = new LogicalVolume(shapeBaseName + "_vol", box, material);
+                                       
+                    String physVolName = shapeBaseName + "_pv"; 
+                    new PhysicalVolume(new Transform3D(pos, rot), physVolName, vol, mother, 0);
+                    
+                    final IExpandedIdentifier expId = new ExpandedIdentifier(helper.getIdentifierDictionary().getNumberOfFields());
+                    expId.setValue(dict.getFieldIndex("system"), subdet.getSystemID());
+                    expId.setValue(dict.getFieldIndex("layer"), layerId);
+                    expId.setValue(dict.getFieldIndex("slice"), slice);                    
+                    int side = 1;
+                    if (py < 0) {
+                        side = -1;
+                    }
+                    expId.setValue(dict.getFieldIndex("side"), side);                                       
+                    final IIdentifier id = helper.pack(expId);                    
+                    new DetectorElement(shapeBaseName, subdet.getDetectorElement(), "/" + physVolName, id);
+                    
+                    ++slice;
+                }
+            }
+        } catch (DataConversionException e) {
+            throw new RuntimeException(e);
+        }
+
+    }
+    
+    public boolean isCalorimeter() 
+    {
+        return true;
+    }
+}

\ No newline at end of file

diff -u -r1.3 -r1.4
--- HPSMuonCalorimeter.java	6 Dec 2012 00:22:36 -0000	1.3
+++ HPSMuonCalorimeter.java	24 Jan 2013 22:25:38 -0000	1.4
@@ -13,7 +13,7 @@

 
 /**
  * @author jeremym

- * @version $Id: HPSMuonCalorimeter.java,v 1.3 2012/12/06 00:22:36 jeremy Exp $

+ * @version $Id: HPSMuonCalorimeter.java,v 1.4 2013/01/24 22:25:38 jeremy Exp $

  */
 public class HPSMuonCalorimeter extends LCDDSubdetector {
 

@@ -99,6 +99,11 @@

                 PhysVol physVol = new PhysVol(vol, mother, pos, rot);
                 physVol.addPhysVolID("layer", layerId);
                 physVol.addPhysVolID("slice", slice);

+                if (py >= 0) {
+                    physVol.addPhysVolID("side", 1);
+                } else {
+                    physVol.addPhysVolID("side", -1);
+                }

                 physVol.addPhysVolID("system", id);
                 
                 ++slice;

diff -N HPSMuonCalorimeterTest.java
--- /dev/null	1 Jan 1970 00:00:00 -0000
+++ HPSMuonCalorimeterTest.java	24 Jan 2013 22:25:38 -0000	1.1
@@ -0,0 +1,48 @@

+package org.lcsim.detector.converter.compact;
+
+import java.io.InputStream;
+
+import junit.framework.Test;
+import junit.framework.TestCase;
+import junit.framework.TestSuite;
+
+import org.lcsim.detector.IDetectorElement;
+import org.lcsim.detector.identifier.IIdentifierDictionary;
+import org.lcsim.detector.identifier.IIdentifierHelper;
+import org.lcsim.geometry.Detector;
+import org.lcsim.geometry.GeometryReader;
+
+public class HPSMuonCalorimeterTest extends TestCase 
+{
+    
+    Detector detector = null;
+    private static final String resource = "/org/lcsim/geometry/subdetector/HPSMuonCalorimeterTest.xml";
+    
+    public static Test suite() 
+    {
+        return new TestSuite(HPSMuonCalorimeterTest.class);
+    }
+
+    public void setUp() 
+    {
+        InputStream in = this.getClass().getResourceAsStream(resource);
+        GeometryReader reader = new GeometryReader();
+        try {
+            detector = reader.read(in);
+        } catch (Throwable x) {
+            throw new RuntimeException(x);
+        }
+    }
+    
+    public void testMuon() 
+    {
+        IDetectorElement de = detector.getSubdetector("MUON").getDetectorElement();
+        System.out.println("MUON has " + de.getChildren().size() + " children.");
+        IIdentifierHelper helper = de.getIdentifierHelper();
+        IIdentifierDictionary dict = helper.getIdentifierDictionary();        
+        System.out.println(dict.toString());
+        for (IDetectorElement child : de.getChildren()) {
+            System.out.println(child.getName() + " => " + helper.unpack(child.getIdentifier()));
+        }
+    }
+}

\ No newline at end of file

diff -u -r1.8 -r1.9
--- HPSMuonCalorimeterTest.xml	11 Dec 2012 23:49:31 -0000	1.8
+++ HPSMuonCalorimeterTest.xml	24 Jan 2013 22:25:38 -0000	1.9
@@ -139,7 +139,8 @@

     <readouts>
         <readout name="MUON_HITS">
             <segmentation type="GridXYZ" gridSizeX="5.0" gridSizeY="5.0" gridSizeZ="0.0" />

-            <id>system:6,side:-2,layer:4,slice:3,ix:32:-8,iy:-6</id>

+            <!--<id>system:6,side:-2,layer:4,slice:3,ix:32:-8,iy:-6</id>-->
+            <id>system:6,side:-2,layer:4,slice:3,x:32:-8,y:-6</id>

         </readout>
     </readouts>
     

@@ -147,4 +148,4 @@

         <gdmlFile file="./testResources/org/lcsim/geometry/subdetector/hps_2014_muon_vacuum_flange.gdml" />
     </includes>
         

-</lccdd>

+</lccdd>

\ No newline at end of file