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Subject: Operational attributes (was"Re: [provision] Standard Schema draft 4 - big issues.")
Kent Spaulding wrote:
We defined capabilities as operations because we could not agree on schema. If we can agree on attributes such as "password" and "passwordExpirationDate", then a client can do much more in a single request.I have yet to read the latest revision, but I'm chime in anyway. On 5/6/07 6:08 PM, "Gary.P.Cole" <Gary.P.Cole@Sun.COM> wrote:1) Should the Schema have operational attributes that duplicate standard capabilities? NOTE: Jeff Bohren dislikes this, but operational attributes allow a single request to do much more than it otherwise could (e.g., create a Person in a disabled state or create an Account with a pre-expired password).Perhaps I misunderstand, but I don't generally like data that is 'active' either... At least for over-the-wire protocols. The idealist says all side-effects are bad. Hmmm, maybe I need some clarification... Am I to understand that if I use 'disabled' as an attribute in the schema to represent disabled accounts, and I do a 'modify' that changes 'disabled' for some account from false to true, I've just enabled the account. I suppose that's not exactly a side-effect... And would be what one might expect. Besides, to avoid this, we'd have to have the notion of read-only (of informational-only) attributes that can't be set. We'd have to complain (or ignore that attribute) in the modify. Having said all that, I suppose, since we went to all that trouble to define all those operations, we should try to avoid confounding them with yet another mechanism - so count me in Jeff's camp. I gave an example in the draft of creating a Person or an Account in a disabled state (with a password that is pre-set and pre-expired). Today that would take four operations, and they are not atomic. Simply put, there is currently no way to create an object in a disabled state. |
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