Requirements
------------

- plugable backends:

  - XML
  - flat file
  - GConf/bonobo conf
  - web registry
  - in memory (trivial?)
  - SQL backend (gda?)

- provide API to the core to load/inspect/save plugins.
- provide user/system registry
- provide combination of backends
- provide backend specific queries

user/system registry
--------------------

first query the user registry, then fall back to system registry.

model:
------

registry_pool
 !
 !---> registry (name, priority)
 !
 !
 !---> registry (name, priority)
 !        !
 !	  !-> plugin
 !	  !
 !	  !-> plugin
 !       ...    !
 !              !-> feature ...
 !
 ...


A registrypool holds a list of registries each with a priority

A registry contains a list of plugins (or libraries)

A plugin contains a list of features (elementfactories, typefacories, ...)

Loading the registry will do

 - instantiate empty GstPlugin objects (loaded flag == FALSE)
 - instantiate empty plugin features






 
API
---