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#74: Allow sharing of ancillary variables among multiple data variables ---------------------------------------+------------------------------------ Reporter: [email protected] | Owner: [email protected] Type: enhancement | Status: new Priority: medium | Milestone: Component: cf-conventions | Version: Resolution: | Keywords: "ancillary data" "standard name modifiers" ---------------------------------------+------------------------------------ Comment (by [email protected]): I think the confusion is a result of a mistake in the original revision to section 3.3 where I said: "This second form permits a single variable to provide ancillary data (see section 3.4) for two or more variables where each has a unique standard name." The statement should have been: "This second form permits a single variable to provide ancillary data (see section 3.4) for one or more variables where each has a unique standard name." The clarification/simplification Russ provides appears to be a good one. The question posed by Jim: Is there any reason why it would be acceptable to have an ancillary variable name multiple standard names if it is only referenced by a single primary? The answer is no. Here is the revised wording change to the CF standard as a result of Russ' recommendation: Change the text in the CF metadata conventions section 3.3 that reads "A standard name is associated with a variable via the attribute standard_name which takes a string value comprised of a standard name optionally followed by one or more blanks and a standard name modifier (a string value from Appendix C, Standard Name Modifiers)." to "A standard name is associated with a variable via the attribute standard_name which takes a string value that can have either of two forms. The first form is a standard name alone. The second form is a blank-separated list beginning with one or more standard names and ending with a single standard name modifier (i.e. standard_name [standard_name ...] standard_name_modifier). The standard name modifiers are defined in Appendix C, Standard Name Modifiers. This second form permits a single variable to provide ancillary data (see section 3.4) for variables that have a standard_name attribute. -- Ticket URL: <https://cf-pcmdi.llnl.gov/trac/ticket/74#comment:16> 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.
