fn_first.json

{
  "title": "fn_first",
  "description": "FHIRPath `first` function.",
  "fhirVersion": ["5.0.0", "4.0.1", "3.0.2"],
  "resources": [
    {
      "resourceType": "Patient",
      "name": [
        {
          "use": "official",
          "family": "f1",
          "given": ["g1.1", "g1.2"]
        },
        {
          "use": "usual",
          "given": ["g2.1"]
        },
        {
          "use": "maiden",
          "family": "f3",
          "given": ["g3.1", "g3.2"],
          "period": {
            "end": "2002"
          }
        }
      ]
    }
  ],
  "tests": [
    {
      "title": "table level first()",
      "tags": ["shareable"],
      "view": {
        "resource": "Patient",
        "select": [
          {
            "column": [
              {
                "path": "name.first().use",
                "name": "use",
                "type": "code"
              }
            ]
          }
        ]
      },
      "expect": [
        {
          "use": "official"
        }
      ]
    },
    {
      "title": "table and field level first()",
      "tags": ["shareable"],
      "view": {
        "resource": "Patient",
        "select": [
          {
            "column": [
              {
                "path": "name.first().given.first()",
                "name": "given",
                "type": "string"
              }
            ]
          }
        ]
      },
      "expect": [
        {
          "given": "g1.1"
        }
      ]
    }
  ]
}