Thank you Wes for the tips for further investigations. I will give it a try next week.
Regards, Ruchard -- http://github.com/RDFLib --- You received this message because you are subscribed to the Google Groups "rdflib-dev" group. To unsubscribe from this group and stop receiving emails from it, send an email to rdflib-dev+unsubscr...@googlegroups.com. To view this discussion on the web visit https://groups.google.com/d/msgid/rdflib-dev/fa604d0b-bb86-4362-ab66-a5192e7f8a0do%40googlegroups.com.