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+#ifndef REALIZING_H_6853748C
+#define REALIZING_H_6853748C
+
+#include "system.h"
+
+class RealizingSystem : public System {
+public:
+
+  RealizingSystem(Game& game) : System(game)
+  {
+  }
+
+  /**
+   * Creates the singleton realizable entity and initializes it with the
+   * provided world definition.
+   */
+  id_type initSingleton(std::string filename);
+
+  /**
+   * Helper method that returns the entity ID of the (assumed) singleton entity
+   * with a RealizableComponent. Throws an exception if the number of realizable
+   * entities is not exactly one.
+   */
+  id_type getSingleton() const;
+
+  /**
+   * Loads the given map.
+   */
+  void loadMap(id_type mapEntity);
+
+  /**
+   * Treats the given entity as part of the active map.
+   */
+  void enterActiveMap(id_type entity);
+
+  /**
+   * Stops treating the given entity as part of the active map.
+   */
+  void leaveActiveMap(id_type entity);
+
+};
+
+#endif /* end of include guard: REALIZING_H_6853748C */