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[fitsbits] INHERIT and Hierarchical Grouping
Doug Tody wrote (06-04-2007) regarding INHERIT:
I agree with Steve that this is a simple example of a broader problem of associating relational entities. FITS is in essence a relational system; every FITS object (even an image) is actually a table. INHERIT is a simple means for specifying the relationship between two or more tables composed as an MEF. A FITS MEF is a simple container with one level of structure. ... The real problem with INHERIT is that it is a simplistic solution to what is a more general problem. Since no one else has commented on this yet, I'll just point out that the Hierarchical Grouping convention (now also open for public comment) provides a more general mechanism for specifying the relationship between multiple HDUs that may be in different files or even on different computer systems. Information about both the INHERIT and Hierarchical Grouping conventions is available at http://fits.gsfc.nasa.gov/fits_registry.html. Does anyone have any comments about the Hierarchical Grouping convention itself? Are there any deficiencies or limitations in this convention that have not been considered? Are there alternative ways of accomplishing the same thing that might be simpler or offer more features than this convention? Bill Pence -- __________________________________________________ __________________ Dr. William Pence NASA/GSFC Code 662 HEASARC +1-301-286-4599 (voice) Greenbelt MD 20771 +1-301-286-1684 (fax) |
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