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Protocol Buffers

Protocol buffers are a flexible, efficient, automated mechanism for serializing structured data. Think XML, but smaller, faster, and simpler. You define how you want your data to be structured once, then you can use specially generated source code to easily write and read your structured data to and from a variety of data streams and using a variety of languages. You can even update your data structure without breaking deployed programs that are compiled against the "old" format.

Using protocol buffers as metadata, Diffusion is able to generate automatic deltas of change.