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// $Id$

module Database
{
  typedef unsigned long Flags;
  
  typedef string Identifier;
  
  exception Unknown_Type
    {
      string type;
    };

  exception Unknown_Key
    {
      string key;
    };

  exception Duplicate_Key
    {
      string key;
    };

  exception Not_Found
    {
      string key;
    };

  interface Entry 
    {
      readonly attribute string name;
    };
  
  interface Employee : Entry 
    {
      attribute long id;
    };
  
  /*
  interface Machine : Entry 
    {
      attribute string make;
    };
  */
  
  struct NamedValue
    {
      Identifier name;
      any value;
      Flags flags;
    };

  typedef sequence<NamedValue> NVPairSequence;
  
  interface Agent 
    {
      Entry create_entry (in string key,
                          in Identifier entry_type,
                          in NVPairSequence initial_attributes)
        raises (Unknown_Type,
                Duplicate_Key);
      
      Entry find_entry (in string key,
                        in Identifier entry_type)
        raises (Unknown_Type,
                Not_Found);
      
      void destroy_entry (in string key,
                          in Identifier entry_type)
        raises (Unknown_Type,
                Unknown_Key);
    };
};