2. Arbitral proceedings shall be deemed to commence on the date on which the notice of arbitration is received by the respondent.
3. The notice of arbitration shall include the following:
(a) A demand that the dispute be referred to arbitration;
(b) The names and contact details of the parties;
(c) Identification of the arbitration agreement that is invoked;
(d) Identification of any contract or other legal instrument out of or in relation to which the dispute arises or, in the absence of such contract or instrument, a brief description of the relevant relationship;
(e) A brief description of the claim and an indication of the amount involved, if any;
(f) The relief or remedy sought;
(g) A proposal as to the number of arbitrators, language and place of arbitration, if the parties have not previously agreed thereon.
4. The notice of arbitration may also include:
(a) A proposal for the designation of an appointing authority referred to in article 6, paragraph 1;
(b) A proposal for the appointment of a sole arbitrator referred to in article 8, paragraph 1;
(c) Notification of the appointment of an arbitrator referred to in article 9 or 10.
5. The constitution of the arbitral tribunal shall not be hindered by any controversy with respect to the sufficiency of the notice of arbitration, which shall be finally resolved by the arbitral tribunal.