4. The method of claim 2 , wherein determining the first property includes: determining the first property from the set of properties based on the type of the fragment object.
4. The method of claim 2 , wherein determining the first property includes: determining the first property from the set of properties based on the type of the fragment object. 5. The method of claim 4 , wherein the shell document includes a second reference to a second fragment object having a corresponding second property and wherein rendering the modified shell document includes: rendering the modified shell document including the response data wherein at least one of the first property and the second property conveys a user-ascertainable characteristic of the first and second fragment objects.