thank you for your feedback. I followed your advice and implemented it the specific way in railML 2.5: There is now a child element <propPassengerInfo> for <track>, <ocp> and <platformEdge> encapsulating the <mediaResources>, but only for the element <ocp> the child element <propPassengerInfo/informationArea> exists.
All the details can be found in Trac tickets #393 [1], #473 [2] and #477 [3].