diff --git a/EGkBiArcs.h b/EGkBiArcs.h
index ad8a3c0..f25d7bb 100644
--- a/EGkBiArcs.h
+++ b/EGkBiArcs.h
@@ -25,5 +25,4 @@
 
 //-----------------------------------------------------------------------------
 EGK_EXPORT ICurve* GetBiArc( const Point3d& ptP0, double dDir0Deg, const Point3d& ptP1, double dDir1Deg, double dU) ;
-EGK_EXPORT ICurve* GetBiArc( const PolyLine& PL, double dU0, double dDir0Deg, double dU1, double dDir1Deg) ;
 
diff --git a/EGkPolyArc.h b/EGkPolyArc.h
index 7bd6ef3..8b91847 100644
--- a/EGkPolyArc.h
+++ b/EGkPolyArc.h
@@ -53,7 +53,8 @@ class PolyArc
       EGK_EXPORT bool ToGlob( const Frame3d& frRef) ;
       EGK_EXPORT bool ToLoc( const Frame3d& frRef) ;
       EGK_EXPORT bool LocToLoc( const Frame3d& frOri, const Frame3d& frDest) ;
-      EGK_EXPORT bool Splice( PolyArc& PA) ;
+      EGK_EXPORT bool Join( PolyArc& PA, double dOffsetPar = 0) ;
+      EGK_EXPORT bool Split( double dU, PolyArc& PA) ;
       EGK_EXPORT const Vector3d& GetExtrusion(void) const
                         { return m_vtExtr ; }
       EGK_EXPORT int  GetRejectedNbr( void) const
diff --git a/EGkPolyLine.h b/EGkPolyLine.h
index 9829d8c..ce31ebd 100644
--- a/EGkPolyLine.h
+++ b/EGkPolyLine.h
@@ -49,7 +49,8 @@ class PolyLine
       EGK_EXPORT bool ToGlob( const Frame3d& frRef) ;
       EGK_EXPORT bool ToLoc( const Frame3d& frRef) ;
       EGK_EXPORT bool LocToLoc( const Frame3d& frOri, const Frame3d& frDest) ;
-      EGK_EXPORT bool Splice( PolyLine& PL) ;
+      EGK_EXPORT bool Join( PolyLine& PL, double dOffsetPar = 0) ;
+      EGK_EXPORT bool Split( double dU, PolyLine& PL) ;
       EGK_EXPORT bool IsClosed( void) const ;
       EGK_EXPORT int  GetRejectedNbr( void) const
                         { return m_nRejected ; }
diff --git a/EgkCurveBezier.h b/EgkCurveBezier.h
index 71fb356..b7438cd 100644
--- a/EgkCurveBezier.h
+++ b/EgkCurveBezier.h
@@ -28,6 +28,7 @@ class __declspec( novtable) ICurveBezier : public ICurve
       virtual bool FromArc( const ICurveArc& crArc) = 0 ;
       virtual int  GetDegree( void) const = 0 ;
       virtual bool IsRational( void) const = 0 ;
+      virtual bool IsAPoint( void) const = 0 ;
       virtual const Point3d& GetControlPoint( int nInd, bool* pbOk = NULL) const = 0 ;
       virtual double GetControlWeight( int nInd, bool* pbOk = NULL) const = 0 ;
       virtual bool GetControlPolygonLength( double& dLen) const = 0 ;
diff --git a/EgtPointerOwner.h b/EgtPointerOwner.h
index 497afc9..c5e2197 100644
--- a/EgtPointerOwner.h
+++ b/EgtPointerOwner.h
@@ -30,7 +30,7 @@ class PtrOwner
    private :
       T* m_pT ;
 
-   template <class T> friend bool IsValid( PtrOwner<T>& RPT) ;
+   template <class T> friend bool IsNull( PtrOwner<T>& RPT) ;
    template <class T> friend T* Get( PtrOwner<T>& RPT) ;
    template <class T> friend T* Release( PtrOwner<T>& RPT) ;
 } ;
@@ -38,9 +38,9 @@ class PtrOwner
 //----------------------------------------------------------------------------
 template <class T>
 bool
-IsValid( PtrOwner<T>& RPT)
+IsNull( PtrOwner<T>& RPT)
 {
-   return ( RPT.m_pT != nullptr) ;
+   return ( RPT.m_pT == nullptr) ;
 }
 
 //----------------------------------------------------------------------------