code: public float readFloat(float defaultValue, String attribute)
      {
          return Float.parseFloat(getValue(String.valueOf(defaultValue), attribute));
      }
docs: Read a float.
  
  @param defaultValue The value returned if attribute not found.
  @param attribute The float name (must not be <code>null</code>).
  @return The float value.
  @throws LionEngineException If invalid argument.