RE: Application design

> From: Joe Pluta
>
> 2. Validation in business logic (business attribute layer)
>

I realize I wasn't particularly precise here.  To be more precise,
validation in business logic can reside in either the business logic or
business atttribute tier; it depends on the nature of the edit.
Single-field edits, such as valid values or ranges, are going to tend
towards the business attribute layer, while more complex edits (if this
field is a '1', then this other field must be non-blank) might be in the
business logic.  This especially occurs when edits are based on foreign
attributes (state cannot be QUEBEC if the customer's country code is USA).


> 3. Validation in presentation layer
>
> Here, the presentation layer makes a request for a list of valid states.
> This request is made to the business logic layer, which in turn
> queries the data deployment layer:

Here, I skipped a step.  The business logic layer queries the business
attribute layer, which finally accesses the data deployment layer.

My apologies for any confusion.

Joe