cubase 5 project into cubase 4

hi there happy new forum, my friend owns cubase 5 and i want to load a project from his cubase 5 into my cubase 4, i gather i can do it via xml archive ,what i want to know is - is every bit of info contained within the xml ,for example, automation , tlmewarp ,mix, etc. in other words is the info of the xml the same as the cpr. thnx .bit slow round here at the mo.