Beginning of clinical encounter

{
  "resourceType" : "SubscriptionTopic",
  "id" : "admission",
  "extension" : [{
    "url" : "http://hl7.org/fhir/StructureDefinition/structuredefinition-wg",
    "valueCode" : "fhir"
  }],
  "url" : "http://example.org/FHIR/R5/SubscriptionTopic/admission",
  "identifier" : [{
    "system" : "urn:ietf:rfc:3986",
    "value" : "urn:uuid:915c2040-b0a8-4935-adf8-94d6e1a74052"
  }],
  "title" : "admission",
  "status" : "active",
  "publisher" : "HL7 International / FHIR Infrastructure",
  "contact" : [{
    "telecom" : [{
      "system" : "url",
      "value" : "http://www.hl7.org/Special/committees/fiwg"
    }]
  }],
  "description" : "Example admission topic",
  "trigger" : [{
    "description" : "Encounter resource moving to state 'in-progress' or event matching HL7v2 ADT^A01",
    "resource" : "http://hl7.org/fhir/StructureDefinition/Encounter",
    "supportedInteraction" : ["create",
    "update"],
    "queryCriteria" : {
      "previous" : "status:not=in-progress",
      "resultForCreate" : "test-passes",
      "current" : "status=in-progress",
      "resultForDelete" : "test-fails",
      "requireBoth" : true
    },
    "fhirPathCriteria" : "%previous.status!='in-progress' and %current.status='in-progress'",
    "event" : {
      "coding" : [{
        "system" : "http://terminology.hl7.org/CodeSystem/v2-0003",
        "code" : "A01",
        "display" : "ADT/ACK - Admit/visit notification"
      }]
    },
    "canFilterBy" : [{
      "description" : "Matching based on the Patient (subject) of an Encounter or based on the Patient's group membership (in/not-in).",
      "resource" : "Encounter",
      "filterParameter" : "patient",
      "modifier" : ["in",
      "not-in"]
    }],
    "notificationShape" : [{
      "resource" : "Encounter",
      "include" : ["Encounter:patient",
      "Encounter:practitioner",
      "Encounter:service-provider",
      "Encounter:account",
      "Encounter:diagnosis",
      "Encounter:observation",
      "Encounter:location"]
    }]
  }]
}