[CF-metadata] per-variable metadata?

[Jeff deLaBeaujardiere]

In another discussion, Steve Hankin wrote:
 > CF generally favors attributes attached to variables over attributes 
attached to files

This reminds me of a question I wanted to ask: does CF have any 
conventions regarding how to handle data that contains multiple observed 
quantities with different quality flags, comment fields or other 
attributes for each quantity?

-Jeff DLB