19. The system of claim 12 wherein the user interface is further configured to receive inputs for identifying a presentation document for the presentation that includes a presentation grammar, and a structured document having structural elements classified with classification identifiers, the system further comprising: means for identifying the second user for the presentation, the second user having said second session copy of the second user profile comprising the second user classification; wherein the computer processing unit is further configured to filter the structured document in dependence upon the second user classification of the session copy of the second user profile and the classification identifiers.
19. The system of claim 12 wherein the user interface is further configured to receive inputs for identifying a presentation document for the presentation that includes a presentation grammar, and a structured document having structural elements classified with classification identifiers, the system further comprising: means for identifying the second user for the presentation, the second user having said second session copy of the second user profile comprising the second user classification; wherein the computer processing unit is further configured to filter the structured document in dependence upon the second user classification of the session copy of the second user profile and the classification identifiers. 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.