Fix DatasetFactory parent

[thewilkybarkid]

Refs DefinitelyTyped/DefinitelyTyped#40794 (comment).

[vhf]

I think it is correct as is, here's how I understand it:

DatasetFactory extends DataFactory, therefore an implementation of DatasetFactory would have all of these:

SomeDatasetFactory {
  // from DataFactory
  NamedNode namedNode(string value);
  BlankNode blankNode(optional string value);
  Literal literal(string value, optional (string or NamedNode) languageOrDatatype);
  Variable variable(string value);
  DefaultGraph defaultGraph();
  Quad quad(Term subject, Term predicate, Term object, optional Term? graph);
  Term fromTerm(Term original);
  Quad fromQuad(Quad original);
  // from DatasetFactory
  Dataset dataset(optional (Dataset or sequence<Quad>) quads);
}

I think another possibility would be to have DatasetCoreFactory extend DataFactory, then we could have DatasetFactory extend DatasetCoreFactory?

[thewilkybarkid]

I think another possibility would be to have DatasetCoreFactory extend DataFactory, then we could have DatasetFactory extend DatasetCoreFactory?

Could also just use unions of the two (reduces the requirements on implementing Dataset(Core)Factory).

[retog]

@ktk feel like reviewing this one too? It seems quite an obvious improvement compared with the status quo.

Btw, how does one get the review privilege?