> It also is the central place for entities "id" field:

DataNucleus, the project (as opposed to the Google plugin), only
"insists" that something is enhanced if you are using its fields/
properties as persistent. If this class has an "id" field and you
expect that field to be persisted then ***JDO*** (or JPA for that
matter too) requires that this class is persistable. If instead you
have a field "id" in that class yet you define a (persistent) property
(getId()/setId()) in the persistable subclasses as then that
superclass doesn't have to be persistable ... i.e as per the JDO/JPA
specs

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