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#95: Development of CF 1.5 Data Model -----------------------------+---------------------------------------------- Reporter: markh | Owner: [email protected] Type: task | Status: new Priority: medium | Milestone: Component: cf-conventions | Version: Resolution: | Keywords: -----------------------------+---------------------------------------------- Comment (by markh): In trying to describe the two coordinate constructs, I have been considering roles and characteristics, and pondering the comments made to date. It appear to me we have two characteristics here and two roles. The management of the role seems to me to sit firmly with the Field, whilst the characteristic is in the nature of the coordinate the Field references. The language used to describe this is not delivering this message for me. I wonder whether we would improve the model by recognising that the 'dimension' or 'auxiliary' nature of the coordinate is defined by the Field while the coordinate characteristics are the responsibility of the coordinate to define. I think this division of responsibility could bring clarity to the model. This leads me to suggest an alteration to the descriptions of the assocations. * A Field will declare: * dim_coordinates: a set of containment associations, each mediated by one and only one explicit domain axis. * aux_coordinates: a set of containment associations, each mediated by a collection of domain axes (recognising the constraints on shape matching). This, in turn, leads me to think that we may have our names wrong for our constructs. The coordinate types are not dimension and auxiliary, they are ordered and unordered. An !OrderedCoord is a coordinate instance which asserts that it has an explicitly defined order: it is sortable, monatonic and 1-dimensional. An !UnorderedCoord is a coordinate instance which does not assert that it has an expliucitly defined order. The only constraint required on the Field is that the dim_coordinates association may only contain !OrderedCoord references. -- Ticket URL: <https://cf-pcmdi.llnl.gov/trac/ticket/95#comment:24> CF Metadata <http://cf-pcmdi.llnl.gov/> CF Metadata This message came from the CF Trac system. To unsubscribe, without unsubscribing to the regular cf-metadata list, send a message to "[email protected]" with "unsubscribe cf-metadata" in the body of your message.
