124     virtual TBool MinimumAvailability() = 0;

   124     virtual TBool MinimumAvailability() = 0;

   125     virtual TBool MandatoryAvailability() = 0;

   125     virtual TBool MandatoryAvailability() = 0;

   126     virtual TBool ExtensionAvailability() = 0;

   126     virtual TBool ExtensionAvailability() = 0;

   127     virtual TBool Available( MMusAvaObserver::TAvailabilityName aAvailability ) = 0;

   127     virtual TBool Available( MMusAvaObserver::TAvailabilityName aAvailability ) = 0;

   128     virtual MMusAvaObserver::TAvailabilityStatus AvailabilityState( MMusAvaObserver::TAvailabilityName aAvailability ) = 0;

   128     virtual MMusAvaObserver::TAvailabilityStatus AvailabilityState( MMusAvaObserver::TAvailabilityName aAvailability ) = 0;

   130     

   129     

   131 private: //Data

   130 private: //Data

   132 

   131 

   133    	/** 

   132    	/** 

   134    	 * Instance identifier key. When instance of an

   133    	 * Instance identifier key. When instance of an