>> Synchronization is NOT necessary to add new slots. >> If you want a new slot, just create a new class with that slot, >> and use both :defsystem-depends-on and :class in your defsystem form. >> This usage pattern wouldn't work on ASDF 1 or early ASDF 2, but >> it works quite well since ASDF 2.016 from June 2011 and later. >> Then, a year after your slot gets merged into asdf:system, >> you can stop using your defsystem-depends-on. > > Feel free to adopt this technique for your proposed website slot, so it > does not cause compatibility problems. Please do not remove other > techniques. > There is no compatibility problem whatsoever with adding optional slots.
And I *will* severely cripple the properties slot, then remove it eventually, but not until after everyone has moved away from it for a year or two. >> The properties mechanism is already totally and irremediably useless. >> Automation across systems is impossible unless everyone agrees on a schema, >> or you somehow merge the zillions of possible ad-hoc schemas; but >> properties actually make synchronization *harder* than lack thereof, >> by making it cheaper to diverge and more expensive to converge. >> Properties without a synchronized schema are useless within a single system, >> where it is easier, safer and more powerful to just directly store data >> in a Lisp variable rather than in the properties. >> >> In other words, properties not only do not serve the purpose >> they look like they are addressing, but cannot possibly serve any purpose. >> They are a lure and a waste of everyone's time — an attractive nuisance. > > I think it would be pretty easy to get everyone to agree on a schema for > properties, and it would be useful to do so. > For the same price, we can agree on a schema, add it to defclass system, and get rid of the attractive nuisance that is component-properties. Silently incompatible is not the same as compatible. —♯ƒ • François-René ÐVB Rideau •Reflection&Cybernethics• http://fare.tunes.org War does not determine who is right — only who is left. — Bertrand Russell _______________________________________________ asdf-devel mailing list asdf-devel@common-lisp.net http://lists.common-lisp.net/cgi-bin/mailman/listinfo/asdf-devel
