1. The law applicable to a contract by virtue of Articles 3 to 6 and 12 of this Convention shall govern in particular:

(a) interpretation;

(b) performance;

(c) within the limits of the powers conferred on the court by its procedural law, the consquences of breach, including the assessment of damages in so far as it is governed by rules of law;

(d) the various ways of extinguishing obligations, and prescription and limitation of actions;

(e) the consequences of nullity of the contract.

2. In relation to the manner of performance and the steps to be taken in the event of defective performance regard shall be had to the law of the country in which performance takes place.