Соответствующая норма
Spain
Practice Relating to Rule 36. Demilitarized Zones
Section A. Establishment of demilitarized zones
Spain’s LOAC Manual (1996) notes that demilitarized zones are areas established by an agreement between the belligerents and designed to protect especially vulnerable sectors of the population from the effects of war. The manual refers to Article 60 of the 1977 Additional Protocol I. 
Spain, Orientaciones. El Derecho de los Conflictos Armados, Publicación OR7-004, 2 Tomos, aprobado por el Estado Mayor del Ejército, Division de Operaciones, 18 March 1996, Vol. I, §§ 1.3.e.(2) and 7.3.b.(5).
Spain’s LOAC Manual (2007) states that the zones in which military operations are not permitted include demilitarized zones. 
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, § 1.2.c.(2); see also § 7.3.b.(5).
The manual further states:
It is in the mutual interest of the parties to the conflict to establish protected areas where particularly vulnerable sectors of the population can be kept safe from the effects of war. In addition to those specifically provided for in the law of armed conflict, which are listed below, other protected areas can be organized through special agreements.
1.3.e.(2). Demilitarized zones
These are areas where military operations cannot be carried out and are accorded this status by express agreement of the parties to the conflict. 
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, §§ 1.3.e and 1.3.e.(2).