code: @Override
      public PersonDocument findByRootAndString(
              final RootDocument rootDocument, final String string) {
          final PersonDocument personDocument = findByFileAndString(
                  rootDocument.getFilename(), string);
          if (personDocument == null) {
              return null;
          }
          final Person person = personDocument.getGedObject();
          person.setParent(rootDocument.getGedObject());
          return personDocument;
      }
docs: {@inheritDoc}