[
  {
    "assertion": 1,
    "retraction": 0,
    "graph": "graph",
    "subject": "obo:SYMP_0000504",
    "predicate": "IAO:0000115",
    "object": "A pain that is characterized by a pain in the head.",
    "datatype": "xsd:string",
    "annotation": "{\"oio:hasDbXref\":[{\"datatype\":\"xsd:string\",\"meta\":\"owl:Axiom\",\"object\":\"url:http://www2.merriam-webster.com/cgi-bin/mwmednlm?book=Medical&va=headache\"}]}"
  }
]