On Wed, 22 Aug 2007, William Pence wrote:

Here are a few comments on several related recent FITS issues:

1. The EXTEND keyword: Since the STEREO mission has started producing FITS

I posted on this in another thread.

2. Repeated keywords: Since the recent discussions have made it clear
that it is not a rare occurrence [...] It seems that the most we
can do at this point is to strongly discourage this practice,
because it is indeterminate which of the keywords will read by
software systems when retrieving the value.

Yes.
Perhaps we might also add some provisions by which duplication
of (all or a specific list of) reserved keywords is forbidden. For
mandatory keywords this is implicitly already specified by the
prescribed order (a double BITPIX, XTENSION or NAXIS1 or PCOUNT are
already illegal ... a double TFIELDS, TFORMn and alike should be !)

Lucio Chiappetti

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