open issues, features not yet implemented, improvements, etc.
-------------------------------------------------------------

the following list is not yet categorized/prioritized, neither 
is it complete :(

- provide clean abstraction for persistence grouping (nodes & properties 
  that should be stored/loaded together in the persistence layer);
- HierarchyManager: cache Path objects (key: ItemId, value: Path[]);
  update cache on hierarchy changes (move, order, remove, etc) 
- inline @todo comments: resolve/implement
- javaDoc, javaDoc, javaDoc
- logging: use Commons Logging (JCL) or Universal and Generic Logging Interface (UGLI)
  instead of log4j (patch supplied by manoj is available pending a JCL/UGLI decision)
- logging: remove unnecessary output, check log categories/verbosity, 
  use 'debug' whenever possible