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+#ifndef REALIZABLE_H_36D8D71E
+#define REALIZABLE_H_36D8D71E
+
+#include "component.h"
+#include <set>
+#include <map>
+#include "entity_manager.h"
+
+class RealizableComponent : public Component {
+public:
+
+  using id_type = EntityManager::id_type;
+
+  /**
+   * Path to the XML file containing the world definition.
+   *
+   * @managed_by RealizingSystem
+   */
+  std::string worldFile;
+
+  /**
+   * Starting map and player location for a new game.
+   *
+   * @managed_by RealizingSystem
+   */
+  int startingMapId;
+  int startingX;
+  int startingY;
+
+  /**
+   * The set of map entities loaded by this entity. It is only intended for
+   * there to be one realizable entity, so this should contain all loaded maps.
+   * The realizable entity has ownership of the loaded maps.
+   *
+   * @managed_by RealizingSystem
+   */
+  std::set<id_type> maps;
+
+  /**
+   * A lookup table that translates a map ID to the entity representing that
+   * loaded map.
+   *
+   * @managed_by RealizingSystem
+   */
+  std::map<size_t, id_type> entityByMapId;
+
+  /**
+   * The entity ID of the currently active map.
+   *
+   * @managed_by RealizingSystem
+   */
+  id_type activeMap;
+
+  /**
+   * Whether or not a map has been activated yet.
+   *
+   * @managed_by RealizingSystem
+   */
+  bool hasActiveMap = false;
+
+  /**
+   * The entity ID of the currently active player.
+   */
+  id_type activePlayer;
+};
+
+#endif /* end of include guard: REALIZABLE_H_36D8D71E */