public static boolean isChildGroup(String group){
  return group.indexOf(GROUP_DELIMITER) != -1;
}

public static boolean isChildGroup ( String group ) { return group . indexOf ( GROUP_DELIMITER ) != - 1 ; }
indicates if a group is a child group , a non - top - level data group in a set of nested data groups ( e . g . , the node or edge table of a graph or tree ) .
