30. The computer program product of claim 23 further comprising: computer instructions, recorded on the storage device, for updating a session document by identifying a presentation document for the presentation including a presentation grammar and a structured document having structural elements classified with classification identifiers; wherein the computer instructions for updating a session document are further configured to identify the second user for the presentation having said second session copy of the second user profile comprising the second user classification and 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.
30. The computer program product of claim 23 further comprising: computer instructions, recorded on the storage device, for updating a session document by identifying a presentation document for the presentation including a presentation grammar and a structured document having structural elements classified with classification identifiers; wherein the computer instructions for updating a session document are further configured to identify the second user for the presentation having said second session copy of the second user profile comprising the second user classification and 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. 31. The computer program product of claim 30 wherein the filtering of the structured document comprises extracting, from the structured document, structural elements having classification identifiers corresponding to the second user classification of the session copy of the second user profile and writing the extracted structural elements into the session structured document in the session document.