child
Bit i = 1 iff the i-th leaf of this subtree has a child subtree at the next level boundary. Used to know which {level}/{x}/{y}.subtree URIs to fetch recursively. Empty when no children exist.
Bit i = 1 iff the i-th leaf of this subtree has a child subtree at the next level boundary. Used to know which {level}/{x}/{y}.subtree URIs to fetch recursively. Empty when no children exist.