[fitsbits] Dataset identifications.

[Arnold Rots]

Frankly, to avoid any confusion, I would advocate putting it in all
relevant headers, including the primary even when it is empty.

  - Arnold

Mark Calabretta wrote:
> 
> On Thu 2004/03/11 12:20:12 CDT, Thomas McGlynn wrote
> in a message to: Thierry Forveille <forveill at cfht.hawaii.edu>
> and copied to: Thomas.A.McGlynn at nasa.gov, fitsbits at nrao.edu
> 
> >one use of the IDs.  However, I'm
> >concerned that if a single FITS file is not atomic with respect
> >to the dataset identifier, then it would generally be difficult
> >for software to use the ID to tie things together.  E.g., one
> >would need to scan the entire FITS file to find the included IDs.
> 
> Putting an index of IDs in the primary header, i.e. just a list of the
> IDs that come later, would preclude the need to scan past the first
> header when looking for a particular ID.
> 
> Mark Calabretta
> ATNF
> 
> 
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Arnold H. Rots                                Chandra X-ray Science Center
Smithsonian Astrophysical Observatory                tel:  +1 617 496 7701
60 Garden Street, MS 67                              fax:  +1 617 495 7356
Cambridge, MA 02138                             arots at head.cfa.harvard.edu
USA                                     http://hea-www.harvard.edu/~arots/
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