Hi there @Ali_Malik !
If you're looking to use tilemap with XML files I'd suggest you watch these series:
He pretty much explains how it works with OGMO.
Also, you could download this game made by a brazilian company called Miniboss:
It comes with a source code so you can feel free to explore how it was developed, they basically used Entities that spawn in their positions due to a XML file.
I think that sums up all I know so far about tilemaps in this framework.
If there is any other way I can help, I'd be glad to do so, but I think that the project is very simple to understand.