<div dir="ltr">My understanding of this sentence is that you cannot use long-string values with mandatory or reserved keywords unless they are explicitly declared as such. Currently, no mandatory or reserved keywords have such a declaration. I don't think it means that FITS plans to implement keywords having more than 8 characters. The Hierarch keyword covers this situation.<div><br></div><div> -- Paul</div></div><br><div class="gmail_quote gmail_quote_container"><div dir="ltr" class="gmail_attr">On Tue, Feb 25, 2025 at 1:49 AM Dubois-Felsmann, Gregory P. via fitsbits <<a href="mailto:fitsbits@listmgr.nrao.edu">fitsbits@listmgr.nrao.edu</a>> wrote:<br></div><blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex">Dear colleagues,<br>
<br>
FITS 4.00, §4.2.1.2 "Continued string (long-string) keywords" contains the statement:<br>
<br>
"The CONTINUE keyword must not be used with of [sic] any of the mandatory or reserved keywords defined in this Standard unless explicitly declared of type long-string."<br>
<br>
I have looked moderately diligently through the whole of FITS 4..00 as well as <a href="https://heasarc.gsfc.nasa.gov/docs/fcg/standard_dict.html" rel="noreferrer" target="_blank">https://heasarc.gsfc.nasa.gov/docs/fcg/standard_dict.html</a> and I cannot find an instance of a keyword "declared of type long-string".<br>
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Was this sentence included as groundwork for the possible future introduction of keywords declared as long-string? Or to support projects that wish to declare keywords of their own as long-string? Or was it intended to actually be used for some particular keyword(s) in the standard, but with that intent withdrawn before 4.00 actually appeared?<br>
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This is not a theoretical question; we are working on polishing our standards-compliance in both Rubin and SPHEREx prior to the release of data to users later this year.<br>
<br>
Many thanks,<br>
Gregory<br>
<br>
--<br>
Gregory Dubois-Felsmann, Ph.D. | Senior Staff Scientist | Caltech/IPAC<br>
Science Platform Scientist, Vera C. Rubin Observatory<br>
Pipeline System Designer, NASA SPHEREx mission<br>
Mail Code MR 100-22 | Pasadena, CA 91125-2200 | <a href="mailto:gpdf@ipac.caltech.edu" target="_blank">gpdf@ipac.caltech.edu</a><br>
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</blockquote></div><div><br clear="all"></div><div><br></div><span class="gmail_signature_prefix">-- </span><br><div dir="ltr" class="gmail_signature"><div dir="ltr">Paul Barrett, PhD<div>Department of Physics</div><div>The George Washington University</div><div>Washington, DC 20052</div><div><br></div></div></div>