Artikel 35

1. If the requesting State Party considers the personal appearance of a witness or expert before its judicial authorities necessary, it shall mention this in its request for the service of a summons to appear. The requested State Party shall invite the witness or expert to appear in the territory of the requesting State Party and shall inform, without delay, the requesting State Party of the reply, if any, of the witness or expert.
2. In the circumstances provided for under paragraph 1, the request or the summons to appear shall indicate the approximate allowances payable as well as the travelling and subsistence expenses reimbursable.
3. If a specific request is made, the requested State Party may grant the witness or expert an advance. The advance shall be reimbursed by the requesting State Party.
4. A witness or expert who has failed to comply with a summons to appear, service of which was requested, shall not, even if this summons contains obligations, be subject to any punishment or measure of constraint, unless the witness or expert later voluntarily enters the territory of the requesting State Party and is there again duly summoned.