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Subsections
New keywords
may be devised in addition to those
described in this standard, so long as they are consistent
with the generalized rules for keywords and do not conflict
with mandatory or reserved keywords.
No keyword in the primary header shall specify
the
presence of a specific extension in
a FITS file; only the EXTEND keyword
described in §5.4.1.2 shall be
used
to indicate the possible presence of extensions. No keyword
in either the primary or extension header shall explicitly
refer to the physical block size, other than the
deprecated BLOCKED
keyword of §5.4.2.1.
5/13/1999