private void Stream(ArrayList data, Edge edge)
        {
            data.Add(new Snoop.Data.ClassSeparator(typeof(Edge)));

             // Curve Type
             {
            string curveType = "None";
            if (edge.AsCurve() != null)
            {
               Curve crv = edge.AsCurve();
               if (crv is Arc)
                  curveType = "Arc";
               else if (crv is CylindricalHelix)
                  curveType = "CylindricalHelix";
               else if (crv is Ellipse)
                  curveType = "Ellipse";
               else if (crv is HermiteSpline)
                  curveType = "HermiteSpline";
               else if (crv is Line)
                  curveType = "Line";
               else if (crv is NurbSpline)
                  curveType = "NurbSpline";
            }
            data.Add(new Snoop.Data.String("Curve Type", curveType));
             }

             try
             {
            data.Add(new Snoop.Data.Object("Curve", edge.AsCurve()));
             }
             catch (System.Exception ex)
             {
            data.Add(new Snoop.Data.Exception("Curve", ex));
             }

             try
             {
               data.Add(new Snoop.Data.Object("Start point reference", edge.GetEndPointReference(0)));
             }
             catch (System.Exception ex)
             {
            data.Add(new Snoop.Data.Exception("Start point reference", ex));
             }

            try
            {
                data.Add(new Snoop.Data.Object("End point reference", edge.GetEndPointReference(1)));
            }
            catch (System.Exception ex)
            {
                data.Add(new Snoop.Data.Exception("End point reference", ex));
            }

            data.Add(new Snoop.Data.Object("Reference", edge.Reference));
            data.Add(new Snoop.Data.Double("Approximate length", edge.ApproximateLength));
            data.Add(new Snoop.Data.Object("Face [0]", edge.GetFace(0)));
            data.Add(new Snoop.Data.Object("Face [1]", edge.GetFace(1)));

            data.Add(new Snoop.Data.CategorySeparator("Tesselated Points"));

            System.Collections.Generic.IList<XYZ> pts = edge.Tessellate();
            int i = 0;
            foreach (XYZ pt in pts)
            {
                data.Add(new Snoop.Data.Xyz(string.Format("PT [{0:d}]", i++), pt));
            }

            // TBD: not sure how to use these yet...
            // TesselateOnFace ??
        }