New Component: Collect statistics of a created dataset.

[l00mi]

This would be the last step of pipeline to create statistics on a dataset aligned with https://www.w3.org/TR/void/#statistics

PS: Might be solved with a SPARQL query.

[ktk]

Drawback of doing that with SPARQL is that we would have to have a TDB step for all datasets, that is something I would like to avoid as it is non-streaming and not necessarily working all the time.

[l00mi]

No need to have the SPARQL query in the Pipeline itself.