code: private static String getOutputPropertyNoDefault(String qnameString, Properties props)
      throws IllegalArgumentException
    {    
      String value = (String)props.get(qnameString);
      
      return value;
    }
docs: Get the value of a property, without using the default properties.  This
  can be used to test if a property has been explicitly set by the stylesheet
  or user.
  
  @param name The property name, which is a fully-qualified URI.
  
  @return The value of the property, or null if not found.
  
  @throws IllegalArgumentException If the property is not supported,
  and is not namespaced.