On Wed, 26 Jul 2023 17:50:40 -0500, Wendell Lovewell wrote:
>Thanks Bill, that's very helpful.
>
>Please let me see if I have this straight yet:
>
>- If there is a format-8 DSCB, there will be a format-9 DSCB.
>
>- If there are > 3 extents (which are handled by the format-1) but < 133
>extents, the format-9 record's DS9PTRDS will -> the first format-3 record.
Handled by the format-8, although the format-1 names are used for format-8
fields.
>
>- For each 13 extents (after the first 3), an additional format-3 record will
>be created.
> The CCHHR of the n+1 format-3 record will be in the "n" format-3's
> DS3PTRDS. (Is it also in the "n" DS9F3 slot?)
That seems to imply that at least one format-3 "n" exists already, and an
additional format-3 ("n+1") is to be added, so perhaps you mean "after the
first 16" instead of "after the first 3". Assuming at least one format-3 "n"
already exists, the CCHHR for the new "n+1" format-3 would be placed in the
"n+1" DS9F3 slot (unless all 10 slots are taken). The CCHHR of the first
format-3 is in the first DS9F3 slot and in DS9PTRDS.
I can't confirm that the DS3PTRDS of the first or "n" format-3 points to the
second or "n+1" format-3,
but it seems likely since that's the way format-3 DSCBs work for non-EAV data
sets with more than 16 extents.
>
>- There will not be an additional format-9 (subtype 1) record unless there are
>more than 10 format-3 records.
> If there are > 133 extents, the DS9PTRDS in the first format-9 record will
> point to the second format-9 record. Otherwise it will point to the first
> format-3 record?
>
Everything I haven't comment on looks correct to me.
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