title: How are png map tiles and .osm xml files related?
body: <p>I need to show indoor custom maps in an Android device. I have created the png tiles using MapTiler (from the building's floor plan), and using JOSM I added nodes and routes, exporting a .osm file.</p>
  
  <p>I was able to show the png tiles by using Nutiteq, but I haven't figured out how to connect the osm file to that.</p>
  
  <p>I am not even sure that the coordinates in the osm file relate to the coordinates in the png tiles, because I used different programs to create these.</p>
  
  <p>Does the png tiles go on a layer, and the nodes from the osm file go on another?</p>
  
  <p>The nodes are basically used to show the rooms' name, and for routing purposes.</p>