diff --git a/EGkSelection.h b/EGkSelection.h
index a537518..da744f1 100644
--- a/EGkSelection.h
+++ b/EGkSelection.h
@@ -46,14 +46,28 @@ typedef std::vector<SelData>  SELVECTOR ;   // vettore di SelData
 typedef std::list<SelData>    SELLIST ;     // lista di SelData
 
 //----------------------------------------------------------------------------
-// Conversione di SelData da e verso stringhe
+// Conversione di SelData da e verso stringhe (Id,Sub)
 inline bool FromString( const std::string& sVal, SelData& Val)
       { return FromString( sVal, Val.v) ; }
 inline const std::string ToString( const SelData& Val, int nPrec = 1)
       { return ToString( Val.v, nPrec) ; }
 
 //----------------------------------------------------------------------------
-// Conversione di vettori di SelData da e verso stringhe
+// Conversione di SelData da e verso stringhe utente (Id:Sub oppure Id)
+inline bool FromUiString( const std::string& sVal, SelData& Val)
+      { std::string sId , sSub ;
+        SplitFirst( sVal, ":", sId, sSub) ;
+        Val = { GDB_ID_NULL, SEL_SUB_ALL} ;
+        FromString( sSub, Val.nSub) ;
+        return FromString( sId, Val.nId) ; }
+inline const std::string ToUiString( const SelData& Val, int nPrec = 1)
+      { if ( Val.nSub != SEL_SUB_ALL)
+           return ToString( Val.nId, nPrec) + ":" + ToString( Val.nSub, nPrec) ;
+        else
+           return ToString( Val.nId, nPrec) ; }
+
+//----------------------------------------------------------------------------
+// Conversione di vettori di SelData da e verso stringhe (Id1,Sub1,Id2,Sub2,...)
 inline bool FromString( const std::string& sVal, SELVECTOR& vVal)
       { INTVECTOR vI ;
         if ( ! FromString( sVal, vI)  ||  ( vI.size() % 2) != 0)
@@ -69,3 +83,23 @@ inline const std::string ToString( const SELVECTOR& vVal, int nPrec = 1)
         if ( ! sDest.empty())
            sDest.pop_back() ;
         return sDest ; }
+
+//----------------------------------------------------------------------------
+// Conversione di vettori di SelData da e verso stringhe utente (Id1:Sub1,Id2,...)
+inline bool FromUiString( const std::string& sVal, SELVECTOR& vVal)
+      { STRVECTOR vsTokens ;
+        Tokenize( sVal, ",", vsTokens) ;
+        vVal.reserve( vsTokens.size()) ;
+        for ( const auto& sToken : vsTokens) {
+           SelData Val ;
+           if ( FromUiString( sToken, Val))
+              vVal.emplace_back( Val) ;
+        }
+        return true ; }
+inline const std::string ToUiString( const SELVECTOR& vVal, int nPrec = 1)
+      { std::string sDest ; sDest.reserve( 2 * 8 * vVal.size()) ;
+        for ( const auto& Val : vVal)
+           sDest += ToUiString( Val, nPrec) + "," ;
+        if ( ! sDest.empty())
+           sDest.pop_back() ;
+        return sDest ; }