prefixes:
 ex: http://example.com#7

mappings:
  person:
   sources:
    - ['data/person.json~jsonpath', '$']
   s: http://example.com/$(ID)
   po:
    - [a, foaf:Person]
    - p: ex:value
      o:
       fn: ex:MyFunction
       pms:
          - ['ex:input', '$(firstname)']