I can execute this command using QueryFactory:
SELECT ?x ?y ?z WHERE {?x ?y ?z }
but if I want to specify the predicate
SELECT ?x ?y ?z WHERE {?x column_name ?z }
it does not work.
Does the predicate and/or subject require a prefix?
If I specify a prefix I don't get an error, but I will have to change all
my data so that the query will work. Is this even a correct query?
