The binding legal principles established are: (1) The parol evidence (integration) rule remains part of South African law and must be enforced - where a document is intended to provide a complete memorial of a jural act, extrinsic evidence may not contradict, add to or modify its meaning; (2) Interpretation of contracts is a matter of law for the court, not a matter of fact for witnesses; (3) Prima facie, all contractual rights can be transmitted unless their nature involves delectus personae or the contract itself shows they were not intended to be ceded; (4) In long leases (particularly urban tenements), there is generally no delectus personae as the lessor does not expect obligations to be carried out personally by the original lessee throughout the entire term; (5) A tenant under an urban tenement may cede rights under a lease without the landlord's consent unless the terms of the lease forbid cession; (6) Contracts must be construed objectively, with courts having regard to the words used; (7) Where parties expressly agree that a written agreement is the sole memorial of their contract, extrinsic evidence cannot be admitted to vary, add to or contradict those terms under the guise of 'context'.