Document Revision History

This table describes the changes to Value Transformer Programming Guide.

Date	Notes
2007-04-06	Added information on new keyed unarchiving transformer.
2007-02-08	Corrected typos.
2006-03-08	Clarified the role of the transformedValueClass method.
2005-08-11	Noted that NSUnarchiveFromData expects objects to provide serial archiving support.
2004-08-31	Corrected minor typos in Role of Value Transformers.
	Clarified the developer’s responsibility when using `NSUnarchiveFromDataTransformerName` in Available Value Transformers.
2004-03-30	Minor edits to the source code in Writing a Custom Value Transformer.
2004-03-10	Revised suggested value transformer initialization method in Registering a Value Transformer.
2003-08-18	Initial publication of Value Transformers.