+StorageModel *surf_storage_model = NULL;
+
+/*************
+ * Callbacks *
+ *************/
+
+surf_callback(void, Storage*) storageCreatedCallbacks;
+surf_callback(void, Storage*) storageDestructedCallbacks;
+surf_callback(void, Storage*, e_surf_resource_state_t, e_surf_resource_state_t) storageStateChangedCallbacks;
+surf_callback(void, StorageAction*, e_surf_action_state_t, e_surf_action_state_t) storageActionStateChangedCallbacks;