code: public ContentsId create(String tableName) {
  
  		if (!has()) {
  			getOrCreateExtension();
  		}
  
  		ContentsId contentsId = new ContentsId();
  		Contents contents = geoPackage.getTableContents(tableName);
  		contentsId.setContents(contents);
  		try {
  			contentsIdDao.create(contentsId);
  		} catch (SQLException e) {
  			throw new GeoPackageException(
  					"Failed to create contents id for GeoPackage: "
  							+ geoPackage.getName() + ", Table Name: "
  							+ tableName, e);
  		}
  		return contentsId;
  	}
docs: Create a contents id
  
  @param tableName
  table name
  @return new contents id