We have just published an updated Sample ADO.NET Provider for Entity Framework. 

Changes in the provider APIs since Beta3 release:

  • removed DbProviderServices.GetProviderManifest(DbConnection)
  • added DbProviderServices.GetProviderManifestToken(DbConnection)
  • completely redesigned CSDL/SSDL/MSL for SchemaInformation
  • changed the format of the provider manifest XML:
     - DefaultValue vs Default
     - removed facets from functions
  • added DbProviderManifest.Token/DbProviderManifest.Provider properties

Provider writers can get the source code from MSDN Code Gallery: http://code.msdn.microsoft.com/EFSampleProvider