{
  "@context": {
    "@version": 1.1,
    "aspentech": "https://atdocs.inmation.com/api/",
    "schema": "https://schema.org/",
    "sosa": "http://www.w3.org/ns/sosa/",
    "ssn": "http://www.w3.org/ns/ssn/",
    "qudt": "http://qudt.org/schema/qudt/",
    "xsd": "http://www.w3.org/2001/XMLSchema#",
    "time": "http://www.w3.org/2006/time#",

    "DataItem": {
      "@id": "sosa:Observation",
      "@context": {
        "path": {"@id": "aspentech:itemPath", "@type": "xsd:string"},
        "value": {"@id": "sosa:hasSimpleResult"},
        "quality": {"@id": "aspentech:opcQuality", "@type": "xsd:integer"},
        "timestamp": {"@id": "sosa:resultTime", "@type": "xsd:dateTime"},
        "engineeringUnit": {"@id": "qudt:unit"},
        "itemType": {"@id": "aspentech:itemType"},
        "name": {"@id": "schema:name"},
        "description": {"@id": "schema:description"},
        "highLimit": {"@id": "aspentech:highLimit", "@type": "xsd:double"},
        "lowLimit": {"@id": "aspentech:lowLimit", "@type": "xsd:double"},
        "alarmHigh": {"@id": "aspentech:alarmHigh", "@type": "xsd:double"},
        "alarmLow": {"@id": "aspentech:alarmLow", "@type": "xsd:double"}
      }
    },

    "Sensor": {
      "@id": "sosa:Sensor",
      "@context": {
        "path": {"@id": "aspentech:itemPath"},
        "name": {"@id": "schema:name"},
        "description": {"@id": "schema:description"},
        "observes": {"@id": "sosa:observes"}
      }
    },

    "HistoricalData": {
      "@id": "sosa:ObservationCollection",
      "@context": {
        "path": {"@id": "aspentech:itemPath"},
        "values": {"@id": "sosa:hasMember", "@container": "@set"},
        "startTime": {"@id": "time:hasBeginning", "@type": "xsd:dateTime"},
        "endTime": {"@id": "time:hasEnd", "@type": "xsd:dateTime"}
      }
    }
  }
}