How to control if a list isn't void?

[salvomic]

hi,
I've this code:

Code:


IF (SIZE(Long_Lat)==2) THEN long:= Long_Lat(1); lat:= Long_Lat(2);
  ELSE long:= →HMS(-14°30′40″); lat:= →HMS(37°55′55″); END;

I need a better way to control if the list Long_Lat {} is not void and has two elements with correct format: {-14°30′40″, 37°55′55″} (or almost two reals)...

thank you
Salvo