At export process dialog, add a feature in the viewer tab to activate internal navigation and internal link.
I mean by internal navigation the way to follow nodes edges after edges (and so provide a choose system if multiple edges) - as windows/context view/neighborhood works for example
I mean by internal link the way to link a node to another one (and even more in a anchor of the label as label could be html !)
The internal link feature could be usefull for example to link particular node to a note legend and so create more interactive map.
& thank's to the whole yWorks team!