  The Ran-Reurings fixed point theorem [Proc. Amer. Math. Soc., 132 (2004),
1435-1443] is but a particular case of Maia's [Rend. Sem. Mat. Univ. Padova, 40
(1968), 139-143]. A "functional" version of this last result is then provided,
in a convergence-metric setting.
