BIND9 Documentation for SOA resource record timing fields?

I've been trying to make use of the documentation bundled with packages as much as possible to reduce my reliance on external resources but in this case I haven't been able to find anything in the BIND documentation for the fields relating to TTL etc on SOA records.
i.e.
SERIAL ; serial number in YYYYMMDDRR REFRESH ; time to refresh RETRY ; time to retry EXPIRE ; time to expire NEGATIVE TTL ; negative ttl
It's well known that these fields are required but where is that defined by BIND?
P.S The wikipedia entry for SOA is helpful for a concise definition https://en.wikipedia.org/wiki/SOA_record
Comments
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The "Administrators Reference Manual" or "ARM is part of the source package. Documentation can also be found at https://kb.isc.org/docs/aa-01493 . All of the field definitions are in the ARM.
One handy item when building DNS, is the loopback zone configuration. I start by copying the loopback configuration files to my new domain-name and edit from there. Sort of a built in example or template when starting from scratch.
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Is this what your looking for?
The BIND ARM:
https://downloads.isc.org/isc/bind9/9.17.4/doc/arm/html/reference.html#resource-recordsThen it points to :
https://en.wikipedia.org/wiki/List_of_DNS_record_typesWhich points to:
RFC1035 and RFC2308Below is a selection from RFC1035:
Mockapetris [Page 18]
RFC 1035 Domain Implementation and Specification November 19873.3.13. SOA RDATA format
+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+ / MNAME / / / +--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+ / RNAME / +--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+ | SERIAL | | | +--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+ | REFRESH | | | +--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+ | RETRY | | | +--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+ | EXPIRE | | | +--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+ | MINIMUM | | | +--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+
where:
MNAME The of the name server that was the
original or primary source of data for this zone.RNAME A which specifies the mailbox of the
person responsible for this zone.SERIAL The unsigned 32 bit version number of the original copy
of the zone. Zone transfers preserve this value. This
value wraps and should be compared using sequence space
arithmetic.REFRESH A 32 bit time interval before the zone should be
refreshed.RETRY A 32 bit time interval that should elapse before a
failed refresh should be retried.EXPIRE A 32 bit time value that specifies the upper limit on
the time interval that can elapse before the zone is no
longer authoritative.Lee
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