Zend_Config multiple sources

Hi,

I would like to be able to take configuration data form multiple source and
combine them in to one single config object. I have read through the zend
docs and the incubator docs and have not seen a way to do this with the
current Zend_config implementation.

Example Use case:

One product to be used by many clients, parts of configuration needs to be
easly client configurable and the other parts of the config should be setup
on there behalf.

So the client configurable would be stored in a db table which would have an
interface for the client to change the values, and a Zend_Config class
'Zend_Config_DB' would be made to load these values.

The other configuration would come from a xml file.

Proposed Changes:

As I see it this would require a structure change, as the storage types
would have to be separated from the Zend_Config object.

Zend_Config
 |
 |--- Zend_Config_Storage
 |     |
 |     |--- Zend_Config_Storage_Interface
 |     |--- Zend_Config_Storage_Array
 |     |--- Zend_Config_Storage_XML
 |     |--- Zend_Config_Storage_INI
 |     |--- Zend_Config_Storage_DB

//The interface for a storage object
interface Zend_Config_Storage_Interface 
{
   //load the data, taken the setp of loading the data out of the
constructor
   public function load( $sections=null );

   //return boolean
   public function hasSections( $sections );
}

//New methods
class ZendConfig 
{
   //Add a storage object
   public function addStorage( Zend_Config_Storage_Interface &$storage)
   {
      //save the storage object for use for later
   }

   //Call this just in time e.g. before a __get __set __isset
   public function _load()
   {
      //Load only once, call all 'load' on storage objects
   }
}

The benefit of this structure is that it would allow the use of different
config sources included the use of the more than one source of the same
type.
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