The JSON Format specifcation states in http://docs.oasis-open.org/odata/odata-json-format/v4.01/csprd03/odata-json-format-v4.01-csprd03.html#sec_ProcessingaBatchRequest that

The service MAY process the individual requests and atomicity groups within a batch request in any order that is compatible with the dependencies expressed with the dependsOn name/value pair. Processing stops on the first error unless the continue-on-error preference is specified.

This makes batch processing somewhat non-deterministic.

Also it is not clear what "stop processing" means:

• If the service chose to process independent groups of requests in parallel, will only groups stop that contain a failing individual request?
• What is contained in the array of responses for "skipped"/"unprocessed" individual requests?

Do we need continue-on-error at all for JSON Batch requests?
If yes: does it only apply to subsequent requests within "dependency chains"?
Or do we intentionally leave this up to the service implementation and thus non-deterministic?