Metadata for POST /annotations #4696

@robertknight

I'm writing an Hypothesis client and I'm to implement annotations posting. I have questions regarding the metadata to be added into the payload.

Should I strictly add the listed metadata as defined in the API spec and in the JS client annotator ?

For example, the annotator extracts the icon and shortcut icon <link rel/>, can the client upload the apple-touch-icon one for example ?

Also, if a resource has already been annotated, does the client need to upload the metadata ? Should the client add the metadata everytime it POST /annotations ?

As an aside, if a resource is annotated a first time without metadata, are metadata taken into account if the resource is annotated another time then but with the metadata payload ?