RFC: proposal for schema refactoring pt. I

=================================
  Proposal for Schema Refactoring
=================================

step one: implement alternate schema retrieval adapters
=======================================================

0. attribute(done, needs refactoring)
0. module
0. annotation
0. utility
    - global (similar to #2)
    - local (similar to #3)

Once we have this we can start considering the problem of step 2

step two: determine effecient practices for schema usage
========================================================

Currently, the schema is store on every single object. Really,
persistence should only be used when needed: ie, schema should only
persist where people will configure them.

level	      	configured by
---------------------------
module		developer
utility(global)	developer/integrator
utility(local)	integrator/manager
annotation	user(owner)
attribute 	user(owner)

I predict except for the hairy implementation stretches represented by
VariableSchemaSupport and ATSENG, 99% of existing code will use the
module level schema. This should mean faster access, make schema 
migrations easy, and
mitigate a bit of ZODB bloat.

step three: codify best practice for schema registration in zcml
================================================================

I would like to see a zcml directive that allows you to hook
up a schema to an interface.  The python equivalent would use
registerType to parse the class and read a class attribute that
determines how the schema should be registered.

Special executable configuration(read modifying the ZODB) will be
require for the local utility case.

Note: this is the first step in making the AT Content class just a
configuration block.  I would eventually like to see AT content just
be z3 content + a python option for declarative config.

Slowly, all behavior current on an AT object would move to adapters.
This is another proposal ;)





-- 

  | david "whit" morriss
  |
  | contact :: http://public.xdi.org/=whit

  "If you don't know where you are,
   you don't know anything at all"

   Dr. Edgar Spencer, Ph.D., 1995


  "I like to write code like
  other ppl like to tune their
  cars or 10kW hifi equipment..."

  Christian Heimes, 2004



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