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Re: [zzdev] Re: :zzSig: Containment dims (was Re2: Questions
- To: Ted Nelson <ted@xxxxxxxxxx>
- Subject: Re: [zzdev] Re: :zzSig: Containment dims (was Re2: Questions
- From: "B. Fallenstein" <b.fallenstein@xxxxxx>
- Date: Sat, 04 May 2002 10:25:26 +0200
- Cc: Jan Theodore Galkowski <jtgalkowski@xxxxxxxxxxxx>, marlene@xxxxxxxxxx, xanni@xxxxxxxxxx, eharter@xxxxxxxxx, zzdev@xxxxxxxxxx
- References: <22.214.171.124.20020502222048.0092bc90@xxxxxxxxxxxxxxxxxxxx> <126.96.36.199.2.20020501222352.00a8fec0@xxxxxxxxxxxxxxxxxxxxxx> <188.8.131.52.20020503235332.00931700@xxxxxxxxxxxxxxxxxxxx>
Yes: the double-dot indicates a *derivative* dimension,
subordinate conceptually to some other dimension.
I have found that often dimensions want to come in pairs,
though I don't remember other examples at this moment.
d.mark and d..mark-set--
so that you can have different sets of marks:
each set of marks is a headcell in d..mark-set,
each marked cell is a headcell in d.mark,
and for each mark there is a relcell that is
on both ranks.
d.trigger and d..trigger-list (won't be used in Gzz, likely)--
headcell on d.trigger is a cell that triggers something if
it changes, headcell on d..trigger-list is a cell that
is re-evaluated when triggered, and for each relationship
trigger cell/triggered cell, there is a relcell on both ranks.
d.cursor and d..cursor-list--
a corner list structure (like the containment structure),
with the elements "under" some other element being the
cursors on that cell; this allows cursors to accurse other
cursor cells, even themselves.
(This probably needs more explanations; a diagram can be found
in the 'zzspec' in the Gzz repository, I think.)
> Note that this notion of containment applies in principle
> to both programs and data. However, nobody has
> seriously implemented containment to enact both.
> (A depth setting has been suggested as a way to prevent
> accidental runaway perpetual loops; but if you *want*
> this mechanism to allow perpetual loops, well, we can
> discuss it :)
Gzz 0.8 or 0.9 will do this, when released. (0.8 will do it if we
I have a question about containment which I'd need to have answered if
containment is to appear 'correctly' in Gzz; Andrew, maybe you can help
me here?-- The question is: Do cells that contain other cells also
contain text in the normal way? Or is it like with clones (they can
contain text internally, but it won't get interpreted)?