Always use accessors. Never access properties directly. ERP5 design is method
oriented. All accessors can be automatically overloaded to support different
data access schemes or extend a static property into a dynamic property (ex. price).
All methods can also act in ERP5 as events through interaction workflows.
This allows for implementing complex interactions and constraints. Not
using accessors would lead to non generic code and potential inconsistencies
with the general ERP5 system. Only the core of ERP5 may in some case access
getter = self.getTitle()
setter = self.setTitle("foo")