Règle correspondante
Switzerland
Practice Relating to Rule 9. Definition of Civilian Objects
Switzerland’s Regulation on Legal Bases for Conduct during an Engagement (2005) states in the section on the principle of distinction: “Protected objects are all objects that are not military objectives.” 
Switzerland, Bases légales du comportement à l’engagement (BCE), Règlement 51.007/IVf, Swiss Army, issued based on Article 10 of the Ordinance for the Organization of the Federal Department for Defence, Civil Protection and Sports of 7 March 2003, entry into force on 1 July 2005, § 159(4).
Switzerland’s ABC of International Humanitarian Law (2009) states: “Civilian objects are all objects which are not military objectives.” 
Switzerland, Federal Department of Foreign Affairs, ABC of International Humanitarian Law, 2009, p. 12.