Need to ensure that JSON Schema tolerates user-defined / other event types beyond the 5 defined subclasses of EPCISEvent

[mgh128]

We were probably too restrictive in fixing a non-deterministic validation issue a few months ago.

Need to review, considering some of José's latest tricks, to make this more flexible.

[jmcanterafonseca-iota]

I have refactored the GS1 JSON Schema to be more modular and on the other hand enable tolerating user-defined / other event types beyond the 5 defined subclasses of EPCISEvent

See. https://github.com/jmcanterafonseca-iota/EPCIS/tree/gs1_epcis_modular_json_schema/JSON/modular-schema

@mgh128 when you have tested it I think it would be worth making a PR.

[jmcanterafonseca-iota]

this can be closed