code: @Override
  	public boolean createExtendedRelationsTable() {
  		verifyWritable();
  
  		boolean created = false;
  		ExtendedRelationsDao dao = getExtendedRelationsDao();
  		try {
  			if (!dao.isTableExists()) {
  				created = tableCreator.createExtendedRelations() > 0;
  			}
  		} catch (SQLException e) {
  			throw new GeoPackageException("Failed to check if "
  					+ ExtendedRelation.class.getSimpleName()
  					+ " table exists and create it", e);
  		}
  		return created;
  	}
docs: {@inheritDoc}