[Zope3-dev] Alternate schema types

[Tres Seaver]

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I would like to break the hard-wired assumption in the forms / widgets
machinery that all schemas must be interfaces with fields;  in
particular, I would like to make the introspection of the fieldset from
a given schema pluggable.

My motivation here is to make it possible to use schemas defined outside
of filesystem Python code play with the forms framework:

 - RDBMS tables and views have introspectable schemas;

 - Applications like CPSSchemas allow the business user to define
   content schema in the CMF equivalent of a site manager;  such
   schemas are clearly introspectable.

 - RelaxNG, W3Schema, DTD, etc. *might* fit into the framework (but
   might require explicit registration of a helper component).

In particular, I would like to tweak zope.app.form.utility.setUpWidgets
such that it does an adapter lookup, in place of the current invocation
of '_fieldlist' (the default adapter would do what '_fieldlist' does now).

I'm attaching a diff which sketches what such a refactoring would look
like.  Comments?


Tres.
- --
===================================================================
Tres Seaver          +1 202-558-7113          tseaver at palladion.com
Palladion Software   "Excellence by Design"    http://palladion.com
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