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It's really, really nice to see an API with all the validating JSON Schemas publically available[1]. I wish everybody did this.

We have been doing a lot of thinking at Snowplow [2] [3] about JSON Schema versioning and self-description. One of the key points as it relates to RESTful APIs is: it's not enough to version your API, you should be versioning the individual entities that your API returns; these entities should be able to individually evolve over time, with the focus on evolving the entities' schemas in additive (i.e. non-breaking ways) for existing clients.

There's quite a lot to learn from the Avro community in all this.

[1] https://github.com/balanced/balanced-api/tree/master/fixture... [2] http://snowplowanalytics.com/blog/2014/05/13/introducing-sch... [3] http://snowplowanalytics.com/blog/2014/05/15/introducing-sel...

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