I recently happened to come across a page where I was able to find this
XPages Domino Object Map 8.5.2. It reminds me of old times when I used to work with version 7. And I really missed the hirerachy map in later versions though I had them byhearted. This one seems to be pretty similar and is a good one. You get to click on the map to see the details associated with them.
I know many would have known it already, but still there must be people who would seek this. So this is my turn to share my discovery :)
Hope this helps :)