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An instance has zero or more named slots; the name of a slot is a symbol. The slots of an instance are determined by its class.
Each slot can hold one value. When a slot does not have a value, the
slot is said to be uninitialized. The default initial value for a
slot is defined by the initial-value and initializer slot
properties.
A slot is said to be accessible in an instance of a class if the
slot is defined by the class of the instance or is inherited from a
superclass of that class. At most one slot of a given name can be
accessible in an instance. Slots are accessed by means of slot-access
methods (usually generated by make-class).