In article <[EMAIL PROTECTED]>,
Erik Bruchez <[EMAIL PROTECTED]> wrote:
> [EMAIL PROTECTED] wrote:
[snip]
> > Regarding the second issue (validation on lower layers of the
> > application, e.g. db management) I guess the way to go is to use the
> > validation processor, which I also tried. So far I got an error which
> > seemed to say it cannot add an error element since there is already one.
> 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.
Keith Hopper
--
City Desk
Waikato University
[PGP key available if desired]
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