LIBRARY <library-identifier>{,<library-identifier>};
USE     <package-identidier>{,<package-identifier>};

ENTITY <entity-identifier> IS 
   [GENERIC ( <generic-identifier> : REAL := <default-value>
	    {;<generic-identifier> : REAL := <default-value>}); ]
   [PORT (<port-kind> <port-identifier> : [<port-mode>] <port-type>
	{;<port-kind> <port-identifier> : [<port-mode>] <port-type>});]
END ENTITY;