Turn swissdata objects into (rdf / turtle) and/or DCAT XML

[mbannert]

we need to be able to turn swissdata objects into opendata harvestable formats. opendata enthusiasts are our natural partners. Hence we want to make collaboration as simple as possible. I am not necessarily saying it has to be the sdtools package, especially because
xml would likely introduce a {xml2} dependency. Not a big deal for devs, but that's a package with an OS level dependency. Maybe xml / turtle is another package in the swissdata ecosystem maybe not. will probably create an experimental branch here soon.

what do you think @christophsax ?

resources:
https://handbook.opendata.swiss/en/category/publish
https://github.com/ropensci/rdflib

DCAT Switzerland AP format (required):
https://handbook.opendata.swiss/en/library/ch-dcat-ap

About opendata.swiss harvester
https://handbook.opendata.swiss/en/publish/harvester.html

dublin core metadata (DCMI):
https://www.dublincore.org/specifications/dublin-core/dcmi-terms/#section-1