virtual bool RemoveCoord( const long index ) ;
virtual bool Coords( const long index , long & X , long & Y ) ;
+ virtual bool IsValid(); // returns true if inPort() and outPort() are type-compatible
+
+ virtual bool IsEqual( SUPERV::Link_ptr theLink ); // returns true if GraphBase::InPort-s and OutPort-s of
+ // this Link and theLink are equal
} ;