Mike As far as i know, postgis accepts both formats as inputs. Specifically, if you want to represent a multipoint in syntax WKT, you will use comma to delimitate the values (e.g. "MULTIPOINT ( -1 1, 0 2, 3 4)" ). However, postgis use an alternate and acceptable WKT representation for multipoint using parenthesis to seperate each point (e.g "MULTIPOINT ((-1 1), (0 2), (3 4))" ), but will output the non-parenthetical version in the ST_AsText, ST_AsEWKT output. Now, i don't know if any application support both formats...
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