prefixes:
  ex: http://example.com/

mappings:
  people:
    graph: ex:myGraph
    subject: http://example.org/$(id)
  cities:
      graph: ex:$(h)
      subject: http://example.org/$(id)
  houses:
        subject: http://example.org/$(id)
        po:
         - p: schema:name
           o: $(name)
           g: ex:myHouseGraph