Exploring Datahub.io Interface - Task 1

[jerdeb]

Explore the possibility of finding the type of api interface (SPARQL endpoint, rdf dump etc...) of a dataset in datahub.io. What is required here is that (if possible) at the end we can create some SPARQL query which returns for example all datasets with a SPARQL endpoint interface (this should include those which are labeled api/sparql, void/sparql, and sparql) and those which contain an rdf dump as well.

We also need to find out if there are any formats which we can be used as streamable data (such as RDF Dumps)

Consider "format SPARQL" (http://datahub.io/dataset?res_format=api/sparql&_tags_limit=0) vs. "VoID SPARQL endpoint" (http://datahub.io/dataset?tags=void-sparql-endpoint&_tags_limit=0), and consider datasets that do have a SPARQL endpoint (http://datahub.io/dataset/l3s-dblp) but are not correctly tagged.