...
Your project structure should now look like the image below.
4. Using Xtext
Adding osm:
I you want to use osm with Xtext your Your starting point should be the the "GenerateXGr16xx.mwe2" file where you need to add the line "referencedResource = "platform:/resource/no.hal.pgo.osm/model/osm.genmodel" as shown in the image below.
You also need to add two dependencies in the MANIFEST.MF inside your xtext folder (see image below).