session "Isabelle_DOF" = Main + 
  options [document = pdf, document_output = "output"]
  theories [document = false]
    (* Foo *)
    (* Bar *)
  theories
    Isa_DOF
    "ontologies/CENELEC_50126"
    "ontologies/Conceptual"
    "ontologies/scholarly_paper"
    "ontologies/mathex_onto"