diff -u -r1.1 -r1.2
--- SiTrackerBarrel.java	6 Oct 2006 19:11:29 -0000	1.1
+++ SiTrackerBarrel.java	6 Oct 2006 23:24:48 -0000	1.2
@@ -3,12 +3,19 @@

 import hep.graphics.heprep.HepRep;
 import hep.graphics.heprep.HepRepFactory;
 

+import java.util.Iterator;
+

 import org.jdom.DataConversionException;
 import org.jdom.Element;
 import org.jdom.JDOMException;

+import org.lcsim.material.Material;
+import org.lcsim.material.MaterialManager;

 
 /**
  *

+ * Reconstruction object for a planar silicon tracker
+ * of type SiTrackerBarrel.
+ *

  * @author Jeremy McCormick <[log in to unmask]>
  * @author Tim Nelson <[log in to unmask]>
  *

@@ -23,7 +30,113 @@

 
     private void build(Element node) throws DataConversionException
     {        

-    	System.out.println("SiTrackerBarrel.build");

+    	//System.out.println("SiTrackerBarrel.build");
+    	
+    	Element detector = node;
+    	
+    	// Loop over modules.
+    	for (Iterator i = detector.getChildren("module").iterator(); i.hasNext();)
+    	{
+    		Element module = (Element)i.next();
+    		
+    		Element module_envelope = module.getChild("module_envelope");
+    		double module_width = module_envelope.getAttribute("width").getDoubleValue();
+    		double module_length = module_envelope.getAttribute("length").getDoubleValue();
+    		double module_thickness = module_envelope.getAttribute("thickness").getDoubleValue();
+    	
+    		// FIXME: Make basic logical module object here. (e.g. non-placed) 
+    		
+    		// Loop over module components.
+    		for (Iterator j = module.getChildren("module_component").iterator(); j.hasNext();)
+    		{
+    			Element module_component = (Element)j.next();
+    			
+    			// module_component parameters.
+    			double module_component_length = module_component.getAttribute("width").getDoubleValue();
+    			double module_component_thickness = module_component.getAttribute("thickness").getDoubleValue();
+    			double module_component_width = module_component.getAttribute("width").getDoubleValue();
+    			Material material = MaterialManager.getMaterial(module_component.getAttributeValue("material"));    			
+    			boolean sensitive = (module_component.getAttribute("sensitive") == null) ? false : module_component.getAttribute("sensitive").getBooleanValue();
+    	
+    			// module_component position.
+    			double module_component_x, module_component_y, module_component_z = 0.0;
+    			if (module_component.getChild("position") != null)
+    			{
+    				Element position = (Element)module_component.getChild("position");
+    				
+    				if (position.getAttribute("x") != null)
+    				{
+    					module_component_x = position.getAttribute("x").getDoubleValue();
+    				}
+    				
+    				if (position.getAttribute("y") != null)
+    				{
+    					module_component_y = position.getAttribute("y").getDoubleValue();
+    				}
+    				
+    				if (position.getAttribute("z") != null)
+    				{
+    					module_component_z = position.getAttribute("z").getDoubleValue();
+    				}
+    			}
+    			
+    			// module_component rotation.
+    			double module_component_rx, module_component_ry, module_component_rz = 0.0;
+    			if (module_component.getChild("rotation") != null)
+    			{
+    				Element rotation = (Element)module_component.getChild("rotation");
+    				
+    				if (rotation.getAttribute("x") != null)
+    				{
+    					module_component_x = rotation.getAttribute("x").getDoubleValue();
+    				}
+    				
+    				if (rotation.getAttribute("y") != null)
+    				{
+    					module_component_y = rotation.getAttribute("y").getDoubleValue();
+    				}
+    				
+    				if (rotation.getAttribute("z") != null)
+    				{
+    					module_component_z = rotation.getAttribute("z").getDoubleValue();
+    				}
+    			}
+    			
+    			// FIXME: Add the module_component to the module here.  --JM
+    		}    		    		
+    	}
+    	
+    	// Loop over layers.
+    	int layern=0;
+    	for (Iterator i = detector.getChildren("layer").iterator(); i.hasNext(); ++layern)
+    	{
+    		Element layer = (Element)i.next();
+    		
+    		// Name of the module associated with this layer.
+    		String module_lkp = layer.getAttributeValue("module");
+    		
+    		// barrel_envelope parameters.
+    		Element barrel_envelope = layer.getChild("barrel_envelope");
+    		double layer_inner_r = barrel_envelope.getAttribute("inner_r").getDoubleValue();
+    		double layer_outer_r = barrel_envelope.getAttribute("outer_r").getDoubleValue();
+    		double layer_z_length = barrel_envelope.getAttribute("z_length").getDoubleValue();
+
+    		// rphi_layout parameters.
+    		Element rphi_layout = layer.getChild("rphi_layout");
+    		double phi_tilt = rphi_layout.getAttribute("phi_tilt").getDoubleValue();
+    		double nphi = rphi_layout.getAttribute("nphi").getIntValue();
+    		double phi0 = rphi_layout.getAttribute("phi0").getDoubleValue();
+    		double rc = rphi_layout.getAttribute("rc").getDoubleValue();
+    		double dr = rphi_layout.getAttribute("dr").getDoubleValue();
+  
+    		// z_layout parameters.
+    		Element z_layout = layer.getChild("z_layout");
+    		double z_dr = z_layout.getAttribute("dr").getDoubleValue();
+    		double z0 = z_layout.getAttribute("z0").getDoubleValue();
+    		int nz = z_layout.getAttribute("nz").getIntValue();
+    		
+    		// FIXME: Make layer object here.  --JM
+    	}

     }
     
     public void appendHepRep(HepRepFactory factory, HepRep heprep)