Factor test commonality into base test
Basic RDF instructions
Skeletons for RDF section
Skeleton ontology for rdf example
Update reference ontology
Reference stub for rdf
RDF instructions update
Explain where to put trainee answer
Update tests to work via roundtrip, and add scaffold
Remove out fixtures
Improve skeleton for rdf write
Add another hint to skeleton for rdf write
Qualify py.test with key
Remove 'large files' instructions for first delivery to save time