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Requirement 1
The format shall be capable of representing various desired astronomical and related information. Several sub-requirements below define a minimum (but not limiting) set of information which the format must be capable of representing.
The format shall be capable of representing multi-dimensional images. {further definition of what is meant by "multi-dimensional image" needed here; possibly data cubes; furthermore, do we need to call out in sub-requirements of this one particular image types, for example "sky image"?}
The format shall be capable of representing tabular data. {describe what is meant by "tabular data"; is this simply a sub-set of a data cube?}
The format shall be capable of representing spectral data. {definition of what "spectral data" means should go here}
The format shall be capable of representing a collection (ordered set) of data within a single instance.
Format collections shall be capable of holding any admixture of individual data product types (e.g. images, data cubes, spectra, tables, etc)
Format collections shall also be capable of holding (sub)-collections so that a hierarchy of data products may be constructed (any admixture of data product types and sub-collections shall be allowed). There shall be no limit to the number of nested levels within the collection hierarchy.