schema.org: encode metadata using JSON-LD instead of Microdata

[GraemeWatt]

Schema.org metadata is currently encoded in HEPData web pages using Microdata (implemented by @eamonnmag). This metadata is indexed for use in the new Google Dataset Search released today. See blog articles from Google AI and DataCite.

JSON-LD is emerging as the community standard and is the preferred format for Schema.org metadata by both Google and DataCite. We should therefore encode Schema.org metadata using JSON-LD instead of Microdata. We should also check that the implementation follows Google's guidelines for dataset providers.

Cc: @mfenner @suenjedt

[mfenner]

@GraemeWatt happy to help with the JSON-LD.

[suenjedt]

Yes, as discussed earlier same here, happy to collaborate on this. cc @ArtemisLav. Back then Eamonn had discussed this with Google btw. Happy to forward the correspondance.

[alisonrclarke]

See #162: plan is to use json-ld from datacite.