{

"resourceType": "SearchParameter",
"id": "example",
"url": "http://hl7.org/fhir/SearchParameter/example",
"version": "1",
"name": "ID-SEARCH-PARAMETER",
"derivedFrom": "http://hl7.org/fhir/SearchParameter/Resource-id",
"status": "draft",
"experimental": true,
"date": "2013-10-23",
"publisher": "Health Level Seven International (FHIR Infrastructure)",
"contact": [
  {
    "name": "[string]",
    "telecom": [
      {
        "system": "url",
        "value": "http://hl7.org/fhir"
      }
    ]
  }
],
"description": "Search by resource identifier - e.g. same as the read interaction, but can return included resources",
"useContext": [
  {
    "code": {
      "system": "http://terminology.hl7.org/CodeSystem/usage-context-type",
      "code": "focus"
    },
    "valueCodeableConcept": {
      "coding": [
        {
          "system": "http://terminology.hl7.org/CodeSystem/variant-state",
          "code": "positive"
        }
      ]
    }
  }
],
"jurisdiction": [
  {
    "coding": [
      {
        "system": "urn:iso:std:iso:3166",
        "code": "US",
        "display": "United States of America (the)"
      }
    ]
  }
],
"purpose": "Need to search by identifier for various infrastructural cases - mainly retrieving packages, and matching as part of a chain",
"code": "_id",
"base": [
  "Resource"
],
"type": "token",
"expression": "id",
"xpath": "f:*/f:id",
"xpathUsage": "normal",
"comparator": [
  "eq"
]

}