General Group Example, Member Based

{
  "resourceType" : "Group",
  "id" : "102",
  "text" : {
    "status" : "additional",
    "div" : "<div xmlns=\"http://www.w3.org/1999/xhtml\">\n      <p>Selected Patients</p>\n      <ul>\n        <li>Patient Donald DUCK @ Acme Healthcare, Inc. MR = 654321</li>\n        <li>Patient Donald D DUCK @ Acme Healthcare, Inc. MR = 123456</li>\n        <li>Patient Simon Notsowell @ Acme Healthcare, Inc. MR = 123457, DECEASED</li>\n        <li>Patient Sandy Notsowell @ Acme Healthcare, Inc. MR = 123458, DECEASED</li>\n      </ul>\n    </div>"
  },
  "extension" : [{
    "url" : "http://hl7.org/fhir/StructureDefinition/structuredefinition-wg",
    "valueCode" : "fhir"
  }],
  "publisher" : "HL7 International / FHIR Infrastructure",
  "contact" : [{
    "telecom" : [{
      "system" : "url",
      "value" : "http://www.hl7.org/Special/committees/fiwg"
    }]
  }],
  "type" : "person",
  "membership" : "enumerated",
  "member" : [{
    "entity" : {
      "reference" : "Patient/pat1"
    },
    "period" : {
      "start" : "2014-10-08"
    }
  },
  {
    "entity" : {
      "reference" : "Patient/pat2"
    },
    "period" : {
      "start" : "2015-04-02"
    },
    "inactive" : true
  },
  {
    "entity" : {
      "reference" : "Patient/pat3"
    },
    "period" : {
      "start" : "2015-08-06"
    }
  },
  {
    "entity" : {
      "reference" : "Patient/pat4"
    },
    "period" : {
      "start" : "2015-08-06"
    }
  }]
}