[fitsbits] Comments on SIP distortion FITS convention

[LC's No-Spam Newsreading account]

I have looked at the submitted document. I had also a quick glance to 
WCS Paper IV (by the way, why is it still in draft status since such a 
long time ?)

The document on the SIP convention fulfills the requirements for 
inclusion in the registry (the document is clear enough and the 
convention has been in real usage and is already supported by commonly 
used software).

Although I'm not an expert at all on distortions, my impression is that 
the SIP convention is definitely simpler, while WCS Paper IV is more 
general.

So my concern would be about the coexistence of two partially 
overlapping conventions ... of course this depends on whether WCS Paper 
IV progresses toward publication (and if it does, it is likely it will 
become part of the standard as the other WCS papers). What are the plans?
Could it incorporate the SIP convention in some compatibility mode ?

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