相关规则
Spain
Practice Relating to Rule 88. Non-Discrimination
Section D. Persons deprived of their liberty
Spain’s LOAC Manual (1996) lists among the rules for the basic treatment of prisoners of war the prohibition of any “discrimination based on sex, race, nationality or political opinion”. 
Spain, Orientaciones. El Derecho de los Conflictos Armados, Publicación OR7-004, 2 Tomos, aprobado por el Estado Mayor del Ejército, División de Operaciones, 18 March 1996, Vol. I, § 8.4.a.(1).
Spain’s LOAC Manual (2007) lists among the rules for the general treatment of prisoners of war: “They must … not be discriminated against on the grounds of sex, race, nationality or political opinion.” 
Spain, Orientaciones. El Derecho de los Conflictos Armados, Tomo 1, Publicación OR7–004, (Edición Segunda), Mando de Adiestramiento y Doctrina, Dirección de Doctrina, Orgánica y Materiales, 2 November 2007, § 8.4.a.(1).
Spain’s Royal Ordinances for the Armed Forces (2009) states that members of the armed forces “[m]ust treat and care for … prisoners [and] detainees … that are in their power without any adverse distinction.” 
Spain, Royal Ordinances for the Armed Forces, 2009, Article 107.