CrossingChasms is a large pattern language that describes how to connect an object system to a RelationalDatabase.

If you'd like the complete text of the language, send email to  mailto:kyle.brown@acm.org or visit our web site at http://members.aol.com/kgb1001001/Chasms.htm (a BrokenLink) [still exists on the InternetArchive: http://web.archive.org/web/20030402004741/http://members.aol.com/kgb1001001/Chasms.htm]. A few patterns from the extended language that are available on wiki are:

	* FourLayerArchitecture
	* TrimAndFitClient
	* PhaseInTiers

-- KyleBrown

You might also want to read TheThirdManifesto, which addresses the object-relational divide from another direction.

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See CrossingTheChasm (a book by GeoffreyMoore)