diff --git a/EGkPolyArc.h b/EGkPolyArc.h
index 8b91847..f144c46 100644
--- a/EGkPolyArc.h
+++ b/EGkPolyArc.h
@@ -98,3 +98,8 @@ class PolyArc
       UPNTBLIST m_lUPointBs ;
       mutable UPNTBLIST::const_iterator m_iter ;
 } ;
+
+//----------------------------------------------------------------------------
+// Raccolte di PolyArc
+typedef std::vector<PolyArc>  POLYARCVECTOR ;   // vettore di PolyArc
+typedef std::list<PolyArc>    POLYARCLIST ;     // lista di PolyArc