[REBOL] Re: Project introduction ... Re: Re: RFC: Rebol Framework
From: al:bri:xtra at: 9-Oct-2002 16:48
pekr wrote:
> I meant something bit different - not real rebol objects, but e.g. earlier
mentined accommodation class. System admin (not necessarily rebol
programmer) can say to himself one day - hey, this hotel has cinema inside.
Where should I put that? So he goes to "object" repository, selects hotel
class, and adds/describes "attribute" (field) of 'cinema-inside? type e.g.
That was what I meant by ability to extend "object" during the system
life-time ...Of course there can be consequences to it, like such field not
existing in former records - so ti may cause some difficulcy to query engine
e.g.
I want and need users to be add or remove fields. A fixed system won't be
better than what we've got all ready.
> > Because one can alter the block at runtime! For example, adding more
fields or removing them. That allows customising each record.
> You can do so with object too. Object = template you load from your
repository. If you want to extend, you can extend the class (block of
set-word and value pairs), and instantiate the object (load block into
context) once again :-)
Unfortunately, one has to then hunt for the other instances of the object in
the net and delete them. It's far more simple and quicker to just clear the
block! (if necessary) then add in fields (Name Value pairs) as required.
Sure, if you're just storing a tree of objects your system will work, but
not if one has network of values.
Andrew Martin
ICQ: 26227169 http://valley.150m.com/
