code: @Override
      public final void loadGedObject(final GedDocumentLoader loader,
              final GedObject ged) {
          if (!(ged instanceof Head)) {
              throw new PersistenceException("Wrong type");
          }
          final Head gedObject = (Head) ged;
          this.setGedObject(gedObject);
          this.setString(gedObject.getString());
          this.setFilename(gedObject.getFilename());
          loader.loadAttributes(this, gedObject.getAttributes());
      }
docs: {@inheritDoc}