{
  "name": "Air Force Open Dataset",
  "description": "Structure documentation for Department of the Air Force open datasets published via data.af.mil",
  "fields": [
    {
      "name": "id",
      "type": "string",
      "required": true,
      "description": "Unique dataset identifier"
    },
    {
      "name": "title",
      "type": "string",
      "required": true,
      "description": "Human-readable dataset title"
    },
    {
      "name": "description",
      "type": "string",
      "required": true,
      "description": "Dataset summary and purpose"
    },
    {
      "name": "publisher",
      "type": "object",
      "required": true,
      "description": "Publishing organization",
      "fields": [
        {
          "name": "name",
          "type": "string",
          "required": true,
          "description": "Organization name"
        },
        {
          "name": "url",
          "type": "string",
          "required": false,
          "description": "Organization URL"
        }
      ]
    },
    {
      "name": "keyword",
      "type": "array<string>",
      "required": false,
      "description": "Tags and keywords for the dataset"
    },
    {
      "name": "theme",
      "type": "array<string>",
      "required": false,
      "description": "Subject categories"
    },
    {
      "name": "modified",
      "type": "string (date-time)",
      "required": false,
      "description": "ISO 8601 last modification date"
    },
    {
      "name": "issued",
      "type": "string (date)",
      "required": false,
      "description": "ISO 8601 publication date"
    },
    {
      "name": "accrualPeriodicity",
      "type": "string",
      "required": false,
      "description": "Update frequency (ISO 8601 interval, e.g. R/P1Y)"
    },
    {
      "name": "accessLevel",
      "type": "enum",
      "required": true,
      "values": ["public", "restricted public", "non-public"],
      "description": "Dataset access level"
    },
    {
      "name": "license",
      "type": "string (uri)",
      "required": false,
      "description": "License URL"
    },
    {
      "name": "distribution",
      "type": "array<object>",
      "required": false,
      "description": "Available download formats",
      "fields": [
        {
          "name": "format",
          "type": "enum",
          "values": ["CSV", "JSON", "XML", "GeoJSON", "Shapefile", "PDF"],
          "description": "File format"
        },
        {
          "name": "downloadURL",
          "type": "string (uri)",
          "description": "Direct download URL"
        },
        {
          "name": "mediaType",
          "type": "string",
          "description": "MIME type"
        }
      ]
    },
    {
      "name": "spatial",
      "type": "string",
      "required": false,
      "description": "Geographic coverage"
    },
    {
      "name": "temporal",
      "type": "string",
      "required": false,
      "description": "Temporal coverage range"
    },
    {
      "name": "contactPoint",
      "type": "object",
      "required": false,
      "description": "Dataset contact information",
      "fields": [
        {
          "name": "fn",
          "type": "string",
          "description": "Contact full name"
        },
        {
          "name": "hasEmail",
          "type": "string (email)",
          "description": "Contact email address"
        }
      ]
    }
  ]
}