Keith Hopper wrote:
I will let Alex maybe give a more thorough answer. But I think that the choice of schema vs. bind is yours, depending on your particular preferences. Now, if schema validation of attributes doesn't appear to work correctly, that may just be a bug, which should be fixed.
Hold it! There are two totally orthogonal concepts in operation here -
Data type checking - which unfortunately goes by the name of schema validation in xml-based technologies - checking that the textual representation conforms to that required for the schema specified data type!.
Data validation - checking that the value (of the correct data type) is correct in the current context.
I respectfully suggest, therefore, that type checking should always be required since data validation can only be done if the data type representation is meaningful. Data validation (using a bind element) may or may not be possible at the client (assuming for the moment that OXF is emulating an XForms client implementation) - dependent on whether the necessary valuu(s) against which cross-checking can be made are avilable at the client - whether, for example, the cross-checking is to be against some 'secret' only known to the server - etc, etc!
Given the above I suggest that the only choice for application developer is whether or not client-side data validation is possible given the particular context in which execution is to take place.
In Presentation Server in particular, and XForms in general, as a designer of your forms, you determine whether and how they are validated. You have two ways of doing this: using an XML schema, or using XForms bind elements. This is what the question was really about, I think.
The result of this is really "data type checking" as you put it. It is really up to the developer to decide to use a schema or binds. Nobody can force him/her to do so. It's just that the mechanisms are in place. But this step should clearly be performed in any serious application, whether strictly server-side or, optionally, and in addition to server-side checking, client-side. Note that right now, Presentation Server does not offer built-in client-side validation, but this would be a very nice addition (and certainly doable, at least in part).
Validating data against a database, for example, is entirely left to the application developer to do, in a PFC action or model, for example.
-Erik
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