diff --git a/EGkPolyLine.h b/EGkPolyLine.h
index 61d0e42..a26e6dd 100644
--- a/EGkPolyLine.h
+++ b/EGkPolyLine.h
@@ -116,6 +116,11 @@ class PolyLine
       EGK_EXPORT bool GetConvexHullXY( PNTVECTOR& vConvHull) const ;
       EGK_EXPORT bool GetMinAreaRectangleXY( Point3d& ptCen, Vector3d& vtAx, double& dLen, double& dHeight) const ;
       EGK_EXPORT bool Trim( const Plane3d& plPlane, bool bInVsOut = true) ;
+      EGK_EXPORT void SetTempProp( int nProp, int nPropInd = 0)
+                          { if ( nPropInd >= 0  &&  nPropInd < 2)
+                               m_nTempProp[nPropInd] = nProp ; } 
+      EGK_EXPORT int  GetTempProp( int nPropInd = 0) const
+                          { return (( nPropInd >= 0  &&  nPropInd < 2) ? m_nTempProp[nPropInd] : 0) ; }
 
    private :
       bool MyChangeStart( int nPos) ;
@@ -123,9 +128,10 @@ class PolyLine
       bool MyMakeConvex( const Vector3d& vtN,  bool bLeftSide) ;
 
    private :
-      int      m_nRejected ;
-      PNTULIST m_lUPoints ;
-      mutable PNTULIST::const_iterator m_iter ;
+      int      m_nRejected ;                       // numero punti rifiutati perchè coincidenti
+      int      m_nTempProp[2] ;                    // vettore proprietà temporanee
+      PNTULIST m_lUPoints ;                        // lista dei punti
+      mutable PNTULIST::const_iterator m_iter ;    // iteratore corrente
 } ;
 
 //----------------------------------------------------------------------------