code: public boolean childrenAreValues() {
          if (m_children == null || m_children.size() == 0) {
              return false;
          }
          for (UNode child : m_children) {
              if (!child.isValue() || !child.getName().equals("value")) {
                  return false;
              }
          }
          return true;
      }
docs: Return true if this node has child nodes and all of them are simple value nodes.
  This means that each child must be a {@link NodeType#VALUE} and its name must be
  "value". If this node has no children or if at least one child is not a simple
  value, false is returned.
  
  @return  True if this node has children and they are all value nodes.