To uniquely specify a property when two components exist with the same name but in different packages.
e.g.
service.webserivces.v1.myService.property1=v1-property
service.webserivces.v2.myService.property1=v2-property
Or to simplify reverse trace the package name e,g.
v1.myService.property1=v1-property
v2.myService.property1=v2-property