Partial TD validation

[danielpeintner]

The scripting API produce() methods allows for passing a TD fragment argument. It is essentially a init dictionary of a TD.

We might want to have a proper validation of this TD fragment argument.
The idea is to use the existing JSON Schema form the ThingDescription document with the only difference that all "required": { ... } keywords are pruned.

Question: difference between TD model and TD fragment used in scripting.
see related discussion for TD model.

[relu91]

I think we should rename this: "Partial TD validation". TD fragments are more relevant for TDD search answers.

[danielpeintner]

Call 2021-01-18: @relu91 volunteered to work on a PR providing an algorithm to validate partial TD input (e.g., by re-using the JSON schema used in the TD spec)