prefixes:
  ex: http://example.com/
  grel: http://users.ugent.be/~bjdmeest/function/grel.ttl#

mappings:
  person:
    sources:
      - [data.csv~csv]
    s: http://example.com/$(id)
    po:
      - p: schema:name
        o:
         - function: grel:toUpperCase(grel:valueParameter = $(name))