Example showing how to use Section Level Profiles

{
  "resourceType" : "StructureDefinition",
  "id" : "example-composition",
  "extension" : [{
    "url" : "http://hl7.org/fhir/StructureDefinition/structuredefinition-wg",
    "valueCode" : "fhir"
  }],
  "url" : "http://hl7.org/fhir/StructureDefinition/example-composition",
  "identifier" : [{
    "system" : "urn:ietf:rfc:3986",
    "value" : "urn:oid:2.16.840.1.113883.4.642.5.1040"
  }],
  "name" : "DocumentStructure",
  "title" : "Document Structure (For testing section templates)",
  "status" : "active",
  "experimental" : false,
  "date" : "2018-11-05T17:47:00+11:00",
  "publisher" : "HL7 International / FHIR Infrastructure",
  "contact" : [{
    "telecom" : [{
      "system" : "url",
      "value" : "http://www.hl7.org/Special/committees/fiwg"
    }]
  }],
  "description" : "Document Structure (For testing section templates)",
  "kind" : "resource",
  "abstract" : false,
  "type" : "Composition",
  "baseDefinition" : "http://hl7.org/fhir/StructureDefinition/Composition",
  "derivation" : "constraint",
  "differential" : {
    "element" : [{
      "id" : "Composition",
      "path" : "Composition"
    },
    {
      "id" : "Composition.section",
      "path" : "Composition.section",
      "slicing" : {
        "discriminator" : [{
          "type" : "pattern",
          "path" : "code"
        }],
        "description" : "Slice by .section.code",
        "ordered" : true,
        "rules" : "closed"
      }
    },
    {
      "id" : "Composition.section:procedure",
      "path" : "Composition.section",
      "sliceName" : "procedure",
      "min" : 1,
      "type" : [{
        "code" : "BackboneElement",
        "profile" : ["http://hl7.org/fhir/StructureDefinition/example-section-library"],
        "_profile" : [{
          "extension" : [{
            "url" : "http://hl7.org/fhir/StructureDefinition/elementdefinition-profile-element",
            "valueString" : "Composition.section:procedure"
          }]
        }]
      }]
    },
    {
      "id" : "Composition.section:medications",
      "path" : "Composition.section",
      "sliceName" : "medications",
      "min" : 1,
      "type" : [{
        "code" : "BackboneElement",
        "profile" : ["http://hl7.org/fhir/StructureDefinition/example-section-library"],
        "_profile" : [{
          "extension" : [{
            "url" : "http://hl7.org/fhir/StructureDefinition/elementdefinition-profile-element",
            "valueString" : "Composition.section:medications"
          }]
        }]
      }]
    },
    {
      "id" : "Composition.section:plan",
      "path" : "Composition.section",
      "sliceName" : "plan",
      "min" : 0,
      "type" : [{
        "code" : "BackboneElement",
        "profile" : ["http://hl7.org/fhir/StructureDefinition/example-section-library"],
        "_profile" : [{
          "extension" : [{
            "url" : "http://hl7.org/fhir/StructureDefinition/elementdefinition-profile-element",
            "valueString" : "Composition.section:plan"
          }]
        }]
      }]
    }]
  }
}