Disambiguate assertions in registration API

[farshidtz]

Closes #266

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[egekorkan]

Thanks 👍

[benfrancis]

"The Registration API MUST provide interfaces to create, retrieve, update, delete, and list (CRUDL) TDs."

@farshidtz Does this mean that read-only (#208) directories are not allowed?

[farshidtz]

"The Registration API MUST provide interfaces to create, retrieve, update, delete, and list (CRUDL) TDs."

@farshidtz Does this mean that read-only (#208) directories are not allowed?

The assertion is not new. The Registration API must provide all of CURDL.

The Registration API is mandatory for a ThingDirectory.

My personal thoughts: a read-only directory can choose not to implement the Registration API and instead a variant of it which only implements retrieval and listing. A read-only directory class can, in future, define that.

[benfrancis]

@farshidtz OK, if in WoT Discovery 1.0 all directories have to be writable, then that's going to be a problem for WebThings Gateway (and I suspect most IoT gateways). I have followed up in #208.