Pod is a module containing Types. A Pod is always backed by a FPod instance which defines all the definition tables. Usually the FPod is in turn backed by a FStore for the pod's zip file. However in the case of memory-only pods defined by the compiler, the fpod.store field will be null. Pods is loaded as soon as it is constructed: 1) All the types defined by the fpod are mapped into hollow Types. 2) It is emitted as a Java class called "fan.{podName}.$Pod". The emitted class is basically a manifestation of the literal tables, after which we can clear the fpod data structures.