JFC,
In March, 1995, when RFC 1766 was published, the BCP track did not exist.
The Standards Track was being used for things that were not protocols
and did not fit well into the 3-stage process. Since BCPs are subject to
the same consensus judging and scrutiny as standards-track documents, it's
been common practice to obsolete old standards-track documents with BCPs
when it's reasonable to think that the original document would have been
a BCP if BCPs had existed at the time.
Bill
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