Import data from URI/Github repo via job spooling

[ktk]

It should be possible to automate import from external RDF data sources like NT dumps and/or provide more extensible ways to transform data from the format provided by the data owner.

• Fetching RDF
  • Basic: provide a specific URI pointing to an RDF Source and define the schedule for re-fetching when updated
  • Extended: additionally provide support to fetch the latest release on Github issues. In this case we would need to specify the name of the github repository as configuration. Via the Github API it's quite easy to figure out the latest release, see for example https://github.com/lindas-uc/ld-didok/blob/master/script/build.sh#L5
• Transforming data to RDF
  • Transform newly available data (CSV, etc.) using a transformer (https://github.com/fusepoolP3/overall-architecture/blob/master/transformer-api.md) accessible at a specified URL.

[ktk]

For everything related to a URI 303 redirects need to be followed