We said we'd use "na" for unset record fields instead of "-", but now I'm pondering over what version of that *exactly*: (1) NA (2) N/A (3) na (4) n/a I'm voting for (4). Other opinions? Robin -- Robin Sommer * Phone +1 (510) 722-6541 * robin at icir.org ICSI/LBNL * Fax +1 (510) 666-2956 * www.icir.org