diff --git a/EGkPolyLine.h b/EGkPolyLine.h
index 72a2afb..4d1f998 100644
--- a/EGkPolyLine.h
+++ b/EGkPolyLine.h
@@ -132,3 +132,30 @@ class PolyLine
 // Raccolte di PolyLine
 typedef std::vector<PolyLine>  POLYLINEVECTOR ;   // vettore di PolyLine
 typedef std::list<PolyLine>    POLYLINELIST ;     // lista di PolyLine
+
+//----------------------------------------------------------------------------
+/*static*/ bool
+ChangePolyLineStart( const Point3d& ptNewStart, PolyLine& Loop, double dTol = EPS_SMALL) ;
+// nSegNum 0-based
+/*static*/ bool
+PointPositionOnPolyLine( const Point3d& ptPoint, /*const*/ PolyLine& Loop, int& nSegNum, double& dParOnSeg, double dTol = EPS_SMALL) ;
+/*static*/ bool
+IsPointInsidePolyLine( const Point3d& ptP, /*const*/ PolyLine& plPoly) ;
+/*static*/ bool
+DistPointPolyLine( const Point3d& ptP, const PolyLine& plPoly, double& dPointPolyLineDist) ;
+/*static*/ bool
+SplitPolyLineAtPoint( const Point3d& ptPoint, /*const*/ PolyLine& Loop, PolyLine& Loop1, PolyLine& Loop2, double dTol = EPS_SMALL) ;
+/*static*/ bool
+AddPolyLineToPolyLine( PolyLine& Poly, PolyLine& PolyToAdd, double dTol = EPS_SMALL) ;
+
+//----------------------------------------------------------------------------
+struct PositionOnPolyLine {
+   int nIndexInVec ;
+   int nSegNum ;
+   double dParOnSeg ;
+   PositionOnPolyLine( int nIndex, int nSeg, double dPar) {
+      nIndexInVec = nIndex ;
+      nSegNum = nSeg ;
+      dParOnSeg = dPar ;
+   }
+} ;