Difference: AccessFormat (2 vs. 3)

This field is still being defined (some discussion is given in the document text). A draft specification will appear in a future version of the document. The intention is to specify both the basic file format as well as the astronomy-specific format, and details such as whether compression is used. This is required, for example, to tell the user what software will be required to do anything useful with the data product. While we can specify how to compose this field, and supply some standard values, it will really be up to the broader community and data providers to define specific values to represent all their data products.

-- DougTody 2 March 2011