diff -N IDetectorElement.java
--- /dev/null	1 Jan 1970 00:00:00 -0000
+++ IDetectorElement.java	28 Feb 2007 21:52:00 -0000	1.1
@@ -0,0 +1,38 @@

+package org.lcsim.detector;
+
+import org.lcsim.detector.identifier.IIdentifiable;
+
+/**
+ * A class to represent a node in the detector tree,
+ * based on Gaudi's IDetectorElement interface.
+ * 
+ * @author Tim Nelson <[log in to unmask]>
+ * @author Jeremy McCormick <[log in to unmask]>
+ * @version $Id: IDetectorElement.java,v 1.1 2007/02/28 21:52:00 jeremy Exp $
+ */
+public interface IDetectorElement extends IIdentifiable
+{
+	/**
+	 * Get the geometric information for this node.
+	 * @return An IGeometryInfo object with geometry information.
+	 */
+    public IGeometryInfo getGeometry();
+            
+    /**
+     * Get the parent element of this node.
+     * @return This node's parent.
+     */
+    public IDetectorElement getParent();
+
+    /**
+     * Get a container with the DE's child DE's.
+     * @return An IDetectorElementContainer with this DE's children.
+     */
+    public IDetectorElementContainer getChildren();
+
+    /**
+     * Get the name of this DE.
+     * @return The name this DE.
+     */
+    public String getName();
+}

\ No newline at end of file

diff -N IGeometryInfo.java
--- /dev/null	1 Jan 1970 00:00:00 -0000
+++ IGeometryInfo.java	28 Feb 2007 21:52:00 -0000	1.1
@@ -0,0 +1,192 @@

+package org.lcsim.detector;
+
+import hep.physics.vec.Hep3Vector;
+
+/**
+ * 
+ * IGeometryInfo.java
+ * 
+ * A port of Gaudi's IGeometryInfo, an abstract interface
+ * to a node in the geometry tree.
+ *
+ * @author Tim Nelson <[log in to unmask]>
+ * @author Jeremy McCormick <[log in to unmask]>
+ */
+public interface IGeometryInfo
+{    
+    public ILogicalVolume getLogicalVolume();
+    
+    public String getLogicalVolumeName();
+	
+    public boolean hasLogicalVolume();
+    
+    // global to local transformation
+    public CoordinateTransformation3D toLocal();
+    
+    // local to global transformation
+    public CoordinateTransformation3D toGlobal();
+    
+    // transform a point in local coordinates to global coordinates
+    public Hep3Vector toGlobal(Hep3Vector local_point);
+    
+    // transform a point in global coordinates to local coordinates
+    public Hep3Vector toLocal(Hep3Vector global_point);
+
+    // get name of daughter volume containing a point in global coordinates
+    public String childVolumeName(Hep3Vector global_point);
+    
+    // get daughter volume containing a point in global coordinates
+    public IPhysicalVolume getPhysicalVolume(Hep3Vector globalPoint);
+        
+    public boolean isInside(Hep3Vector point);
+    
+    public Hep3Vector getPosition();
+    
+    String belongsToPath(Hep3Vector globalPoint);
+    
+    String belongsToPath(Hep3Vector globalPoint, int level);
+    
+    IGeometryInfo belongsTo(Hep3Vector globalPoint);
+    
+    IGeometryInfo belongsTo(Hep3Vector globalPoint, int level);
+    
+    /** find full geometry information for given point
+     * @param point input 3D point
+     * @param level number of levels to nagigate down the hierarchy
+     * @param start is the location (or path) of "nearest regular
+     *        DetectorElement", which simultaneously contains the
+     *        Point and has the connection with Actual Geometry Tree.
+     * @param volumePath retuned information
+     */
+    IPhysicalVolumePath getFullGeoInfoForPoint(
+    		Hep3Vector point, 
+    		int level, 
+    		IGeometryInfo start);
+    
+    /** find full geometry information for given point
+     * @param point input 3D point
+     * @param level number of levels to nagigate down the hierarchy
+     * @param start is the location (or path) of "nearest regular
+     *        DetectorElement", which simultaneously contains the
+     *        Point and has the connection with Actual Geometry Tree.
+     * @param replicaPath retuned information
+     */
+//    virtual StatusCode fullGeoInfoForPoint
+//    ( const Gaudi::XYZPoint&        point       ,
+//      const int                level       ,
+//      IGeometryInfo*&          start       ,
+//      ILVolume::ReplicaPath&   replicaPath ) = 0;
+    
+    /** find full geometry information for given point
+     * @param point input 3D point
+     * @param level number of levels to nagigate down the hierarchy
+     * @param start is the location (or path) of "nearest regular
+     *        DetectorElement", which simultaneously contains the
+     *        Point and has the connection with Actual Geometry Tree.
+     * @param volumePath retuned information
+     */
+    IPhysicalVolumePath fullGeoInfoForPoint
+    ( Hep3Vector point, int level, String start);
+    
+    /** find full geometry information for given point
+     * @param point input 3D point
+     * @param level number of levels to nagigate down the hierarchy
+     * @param start is the location (or path) of "nearest regular
+     *        DetectorElement", which simultaneously contains the
+     *        Point and has the connection with Actual Geometry Tree.
+     * @param replicaPath retuned information
+     */
+//    virtual StatusCode fullGeoInfoForPoint
+//    ( const Gaudi::XYZPoint&        point       ,
+//      const int                level       ,
+//      std::string&             start       ,
+//      ILVolume::ReplicaPath&   replicaPath ) = 0;;
+    
+    /**  the information about the support
+     *  @param start  "start" geometry info
+     *  @param replicaPath replica path
+     *  @return status code
+     */
+    //virtual StatusCode location
+    //( IGeometryInfo*&        start ,
+    //  ILVolume::ReplicaPath& replicaPath ) const = 0;
+    
+    /**  the information about the support
+     *  @param start  "start" geometry info
+     *  @param replicaPath replica path
+     *  @return status code
+     */
+    //virtual StatusCode location
+    //( std::string&           start ,
+    //  ILVolume::ReplicaPath& replicaPath ) const = 0;
+    
+    /** the name of Logical Volume, addressed by  start and Replica Path
+     *  @param start start
+     *  @param replicaPath replicaPath
+     *  @return the name of Logical Volume
+     */
+    //virtual std::string lvolumePath
+    //( const std::string&           start       ,
+    //  const ILVolume::ReplicaPath& replicaPath ) = 0;
+    
+    /** the Logical Volume, addressed by  start and Replica Path
+     *  @param start start
+     *  @param replicaPath replicaPath
+     *  @return pointer to Logical Volume
+     */
+    //virtual const ILVolume* lvolume 
+    //( const std::string&           start       ,
+    //  const ILVolume::ReplicaPath& replicaPath ) = 0;
+    
+    /** the name of Logical Volume, addressed by  start and Replica Path
+     *  @param start start
+     *  @param replicaPath replicaPath
+     *  @return the name of Logical Volume
+     */
+    //virtual std::string lvolumePath
+    //( IGeometryInfo*               start       ,
+    //  const ILVolume::ReplicaPath& replicaPath ) = 0;
+    
+    /** the Logical Volume, addressed by  start and Replica Path
+     *  @param start start
+     *  @param replicaPath replicaPath
+     *  @return pointer to Logical Volume
+     */
+    //virtual const ILVolume* lvolume 
+    //( IGeometryInfo*               start       ,
+    //  const ILVolume::ReplicaPath& replicaPath ) = 0;
+    
+    /// retrive reference to replica path (mistrerious "rpath" or "npath")
+    //virtual const ILVolume::ReplicaPath& supportPath() const = 0;
+
+    /** @} */ // end of group LogVol
+
+    /** pointer to the parent IGeometryInfo (const version)
+     *  @return pointer to the parent IGeometryInfo
+     */
+    IGeometryInfo parentIGeometryInfo();
+
+    //  virtual IGeometryInfo* supportIGeometryInfo() = 0 ;
+
+    /** (reference to) container of children IGeometryInfo
+     *  return  reference to container of children IGeometryInfo
+     */
+    //virtual IGeometryInfo::IGIChildrens& childIGeometryInfos() = 0;    
+
+    interface IGeometryInfoIterator
+    {
+    	IGeometryInfo next();
+    	IGeometryInfo prev();
+    	IGeometryInfo end();
+    	IGeometryInfo begin();
+    }
+
+    IGeometryInfoIterator childBegin();
+    
+    IGeometryInfoIterator childEnd();
+    
+    // Gaudi has "get the exact full geometry location"  What does this mean???
+    // One interpretation, entire heirarchy as map of LVolumes to 
+    //    positions in coordinates of each volume
+    // public Map<ILVolume,Hep3Vector>    
+}

\ No newline at end of file