Hi Rolemo
Unaries (e.g. Person smokes) are often more natural than their equivalent binaries (e.g. Person has SmokingStatus), so I tend to use them a lot. However if you have a set of 2 or more mutually exclusive unaries (e.g. Person is male; Person is female) it is more efficient to use a single binary (e.g. Person is of Gender {'M', 'F'}).
Currently NORMA treats unaries as open world, so if you want a closed world interpretation right now you might prefer the binary approach. In a later build of NORMA we plan to support both open (including open with negation) and closed word approaches for unaries.
Cheers
Terry