texturing_properties.py

def register():
    for cls in classes:
        register_class(cls)

    bpy.types.Material.pov_texture_slots = CollectionProperty(type=MaterialTextureSlot)
    bpy.types.Texture.pov = PointerProperty(type=RenderPovSettingsTexture)


def unregister():
    del bpy.types.Texture.pov
    del bpy.types.Material.pov_texture_slots

    for cls in reversed(classes):
        unregister_class(cls)