code: public UNode getMember(String name) {
          if (m_childNodeMap == null) {
              return null;
          }
          return m_childNodeMap.get(name);
      }
docs: Get the child node (member) of this UNode with the given name. If this UNode isn't
  a MAP or there is no child node with the given name, null is returned. Note: the
  UNode returned is not copied.
  
  @param name  Candidate name of a child member node.
  @return      Child UNode with the given name, if any, otherwise null.