Make access to properties protected (accessible to children).

+mgen/MgGeoArea4LineEllipsoidalVoid.m

 classdef MgGeoArea4LineEllipsoidalVoid < mgen.MgGeoArea4Line
     % A 4-line defined area of the geometry with a ellipsoidal hole
 
-    properties
+    properties (Access = protected)
         nrings = 2;   % the number of rings between hole and outer lines
         parama = 1;   % ellipse parameter a
         paramb = 1;   % ellipse parameter b
@@ -115,7 +115,7 @@ classdef MgGeoArea4LineEllipsoidalVoid < mgen.MgGeoArea4Line
                 end
                 % some bugs occurs if user sets the type of normFunction.
                 if self.normFunction.vals(1)>self.normFunction.vals(2)
-                   self.normFunction.vals=sort(self.normFunction.vals)
+                   self.normFunction.vals=sort(self.normFunction.vals);
                 end
 
                 scale = self.normFunction.eval( mm/segments );
@@ -153,6 +153,7 @@ classdef MgGeoArea4LineEllipsoidalVoid < mgen.MgGeoArea4Line
                     end
                 end
             end
+
 	          % defensive programming: check if ringNodes is filled.
             assert(~isempty(self.ringNodes));