21. The system of claim 20 wherein the computer processing unit is further configured to filter the presentation grammar, in dependence upon the extracted structural elements, into a session grammar in the session document.
20. The system of claim 19 wherein the computer processing unit is further configured to extract, from the structured document, structural elements having classification identifiers corresponding to the second user classification of the session copy of second user profile, the system further comprising: means for writing the extracted structural elements into the session structured document in the session document.