Use a rdflib for OpenGraphProtocol and schema.org parsing

[dlrobertson]

Summary

We be able to use rdflib + rdflib-jsonld as the parsers for the Open Graph Protocol and json-ld parsing. I have a WIP version of this here.

Pros & Cons

Pros

• rdflib and rdflib-jsonld are both well maintained libraries.
• We don't have to write/maintain a parser!
• Users could access the Graph.

Cons

• Adding another dependency.
• In some of my testing, parsing seemed slower.
• It may not actually simplify things. See the WIP version [here] for examples.

[barrust]

Would this also help resolve #91?

Would the added dependency restrict access to the library? I.e., would it work in all environments?

[dlrobertson]

Would this also help resolve #91?

Yes

would it work in all environments?

I wasn't able to find anything that would indicate otherwise.

After some more testing, I've unfortunately noticed several cases where it doesn't work too well (in my current implementation).