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All extensions ,
whether or not further described in this standard, shall
fulfill the following requirements to be in conformance with
this FITS standard.
shall have a unique type name,
specified in the
header according to the syntax codified in §18.104.22.168.
To preclude conflict, extension type names must be
with the IAUFWG.
The FITS Support Office shall
maintain and provide a list of the registered extensions.
The total number of bits in the data of each extension
shall be specified in the header for that extension, in the
manner prescribed in §22.214.171.124.
No extension shall be
constructed that invalidates existing FITS files.