code: String asString() {
          if (mParent == null) {
              return "anyPolicy  ROOT\n";
          } else {
              StringBuilder sb = new StringBuilder();
              for (int i = 0, n = getDepth(); i < n; i++) {
                  sb.append("  ");
              }
              sb.append(policyToString(getValidPolicy()));
              sb.append("  CRIT: ");
              sb.append(isCritical());
              sb.append("  EP: ");
              for (String policy : getExpectedPolicies()) {
                  sb.append(policyToString(policy));
                  sb.append(" ");
              }
              sb.append(" (");
              sb.append(getDepth());
              sb.append(")\n");
              return sb.toString();
          }
      }
docs: Prints out some data on this node.