[fitsbits] structurally compliant FITS

[patrick.wallace at stfc.ac.uk]

> About "optional" and "harmless".

In my view the distinction between standard FITS and optional
conventions is so crucial that there should be separate documents
(or perhaps "should have been" if it is now too late).

The standard should contain what FITS readers/writers *must*
implement;  the other document, perhaps called a "style guide",
would set out and name the various well-established conventions
that implementors may or may not provide for.


Patrick Wallace
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RAL Space                                            +44-1235-531198
STFC Rutherford Appleton Laboratory
Harwell Oxford
Didcot, Oxfordshire, OX11 0QX, UK         Patrick.Wallace at stfc.ac.uk
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