Art. 56 OG; choice of foreign law by the parties and scope of Federal Court review. Where the parties in the cantonal proceedings expressly invoke foreign law as governing the contractual relationship, that concordant position is in principle decisive for the applicability of foreign law, unless a party disposition is excluded for special reasons. The same applies a fortiori when the contract's performance elements are situated abroad, in particular where the price is payable abroad and delivery is to occur abroad (consid. 1-3). A damages claim based on defective performance is governed by the same law as the underlying contractual duty. A later contract of similar content is presumed, absent contrary indications, to be subject to the same law as the earlier transaction.
in Erwägung