23. The computer program product of claim 22 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.
24. The computer program product of claim 23 further comprising computer program instructions that upon being executed cause a computer to carry out the steps of filtering the presentation grammar, in dependence upon the extracted structural elements, into a session grammar in the session document.