BUDU II v. CAESAR & ORS.  Land—Essential characteristics of an arbitration—Private owner not estopped by having stood by when Stool wrongfully declared his land as Stool property—Nor by non-compliance with resolution of State Council unless latter has been given force of law—Stool's concurrence in re-sale by its purchaser inessential—Subject occupying Stool land owes the Stool customary duties, but not tolls or tribute—Description in Certificate of Purchase not always conclusive.