A PersistenceEngine is closely related to an ObjectOrientedDatabase, but is more tightly bound to the execution environment than the term 'database' implies.

A PersistenceEngine allows the application developer to assume an InfiniteAmountOfTransactionalMemory.  Whether or not this is a GoodThing is a matter of debate.
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Persistence engines:
	* PyPerSyst
	* ThePrevayler
	* GemStone
	* GemStonej
	* JydJavaPersistenceEngine
	* OmniBase
	* Voss
	* Tenacity
	* OzoneDb
	* BullAnt
	* ActiveRecord