I am aware of one vocabulary for data processing levels, the NASA Levels (1, 2, 3) list. Does anyone know of any other vocabularies that describe the level of data processing embodied by a data set? John -------------- John Graybeal <mailto:[log in to unmask]> -- 831-775-1956 Monterey Bay Aquarium Research Institute Marine Metadata Interoperability Project: http://marinemetadata.org