{
  "@context": {
    "@version": 1.1,
    "schema": "https://schema.org/",
    "ndl": "https://data.nasdaq.com/vocab#",
    "xsd": "http://www.w3.org/2001/XMLSchema#",
    "dcat": "http://www.w3.org/ns/dcat#",
    "dcterms": "http://purl.org/dc/terms/",

    "Dataset": {
      "@id": "dcat:Dataset",
      "@type": "@id"
    },
    "id": {
      "@id": "schema:identifier",
      "@type": "xsd:integer"
    },
    "dataset_code": {
      "@id": "dcterms:identifier"
    },
    "database_code": {
      "@id": "ndl:databaseCode"
    },
    "name": {
      "@id": "schema:name"
    },
    "description": {
      "@id": "dcterms:description"
    },
    "refreshed_at": {
      "@id": "dcterms:modified",
      "@type": "xsd:dateTime"
    },
    "newest_available_date": {
      "@id": "dcterms:temporal",
      "@type": "xsd:date"
    },
    "oldest_available_date": {
      "@id": "dcat:startDate",
      "@type": "xsd:date"
    },
    "column_names": {
      "@id": "dcat:column"
    },
    "frequency": {
      "@id": "dcterms:accrualPeriodicity"
    },
    "premium": {
      "@id": "ndl:premium",
      "@type": "xsd:boolean"
    },

    "Database": {
      "@id": "dcat:Catalog",
      "@type": "@id"
    },
    "database_code_catalog": {
      "@id": "dcterms:identifier"
    },
    "datasets_count": {
      "@id": "dcat:dataset",
      "@type": "xsd:integer"
    },

    "DataPoint": {
      "@id": "schema:Observation",
      "@type": "@id"
    },
    "date": {
      "@id": "schema:dateCreated",
      "@type": "xsd:date"
    },
    "value": {
      "@id": "schema:value",
      "@type": "xsd:decimal"
    },

    "DatatableRow": {
      "@id": "schema:PropertyValue",
      "@type": "@id"
    }
  }
}