Protocol No. 16 to the Convention for the Protection of Human Rights and Fundamental Freedoms
"1. Highest courts and tribunals of a High Contracting Party, as specified in accordance with Article 10, may request the Court to give advisory opinions on questions of principle relating to the interpretation or application of the rights and freedoms defined in the Convention or the protocols thereto.
2. The requesting court or tribunal may seek an advisory opinion only in the context of a case pending before it.
3. The requesting court or tribunal shall give reasons for its request and shall provide the relevant legal and factual background of the pending case..."