fhir 0.1.0

{
  "key": "sdf-4",
  "severity": "error",
  "human": "If the structure is not abstract, then there SHALL be a baseDefinition",
  "expression": "abstract = true or baseDefinition.exists()",
  "source": "http://hl7.org/fhir/StructureDefinition/StructureDefinition",
  "requirements": "Ensure that the base types are abstract",
  "extension": [
    {
      "url": "http://example.com"
    }
  ]
}