- even just implement a raw *Operation*
-- Operation subclasses should be written in a way so-as to avoid any blocking I/O
+ even just implement a raw *Operation*. *OperationPartial* is the super class of
+ *HttpOperation* and *BidirectionalTopicOperation* and provides most of the methods
+ used by the Operation subclasses, including a number of utility methods (e.g.,
+ cancellable *allOf*)
+- Operation subclasses should be written in a way so-as to avoid any blocking I/O. If
+ this proves too difficult, then the implementation should override *doOperation()*
+ instead of *startOperationAsync()*