String constants and once functions

What are the differences between this two features?

feature -- String constants

	foo: STRING is "Foo is nice"
		-- foo string

	foo_once: STRING is
			-- foo string implemented as an once function
		once
			Result := "Foo is nice and made once"
		end

I'm not sure: they should be almost the same shouldn't them?

Note for SmartEiffel people: have you ever tried to insert once strings
in the standard throught ECMA, NICE or anything else?

To Gobo people: is it the right mailing list to ask for portability
iusses?

Cheers,
	Paolo





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