[HACKYSTAT-DEV-L] questions on evolving sdts

[(Cedric) Qin ZHANG]

Hi, Philip,

(1) When we rename a attribute or move the attribute from 
keyValStringMap to pMap, do we need to deleted the old entries in 
keyValStringMap and keyValMap?

(2) It seems in SensorDataEntry, whenever you put something in 
keyValStringMap, you also put a corresponding version in keyValMap. What 
if I only put things in keyValStringMap?

(3) For attributes moved to pMap, do we still need to provide access 
method, or do we just let use dig into pMap themselves?

(4) If we decide to provide access methods for optional fields, then if 
that filed does not exist, do we return default value or throw exception?

Thanks.

Cedric