code: public int intValue(String name, String namespace) {
          String s = childValue(name, namespace);
          if (s != null) {
              return Integer.parseInt(s);
          }
          throw new IllegalArgumentException(this + ": content: " + name);
      }
docs: Returns an integer value of the supplied child or throws an exception if missing.
  @param name the child element name
  @param namespace the element namespace
  @return the value