code: @Override
      public final SubmissionDocument findByRootAndString(
              final RootDocument rootDocument, final String string) {
          final SubmissionDocument submissionDocument =
                  findByFileAndString(rootDocument.getFilename(), string);
          if (submissionDocument == null) {
              return null;
          }
          final Submission submission = submissionDocument.getGedObject();
          submission.setParent(rootDocument.getGedObject());
          return submissionDocument;
      }
docs: {@inheritDoc}