15. The system of claim 14 wherein filtering the structured document comprises: extracting, from the structured document, structural elements having classification identifiers corresponding to the user classifications of the session copy of a user profile; and writing the extracted structural elements into the session structured document in the session document.
14. The system of claim 9 further comprising computer program instructions that, upon being executed, cause the system to carry out the step of updating a session document, including: identifying a presentation document for the presentation, the presentation document including a presentation grammar and a structured document having structural elements classified with classification identifiers; identifying a user for the presentation, the user having a session copy of a user profile comprising user classifications; and filtering the structured document in dependence upon the user classifications of the session copy of a user profile and the classification identifiers.