{
  "$schema": "https://json-schema.org/draft/2020-12/schema",
  "$id": "https://dr.ntu.edu.sg/schemas/item.json",
  "title": "DR-NTU (Digital Repository) Item",
  "description": "A DSpace 7 item resource as embedded in discovery search results from DR-NTU (Digital Repository of NTU).",
  "type": "object",
  "required": ["uuid", "type", "metadata"],
  "properties": {
    "uuid": { "type": "string", "format": "uuid" },
    "name": { "type": "string" },
    "handle": {
      "type": "string",
      "description": "Persistent handle, e.g. 10356/213929."
    },
    "metadata": {
      "type": "object",
      "description": "Map of metadata field keys (e.g. dc.title) to arrays of value objects.",
      "additionalProperties": {
        "type": "array",
        "items": { "$ref": "#/$defs/metadataValue" }
      }
    },
    "inArchive": { "type": "boolean" },
    "discoverable": { "type": "boolean" },
    "withdrawn": { "type": "boolean" },
    "type": { "type": "string", "const": "item" },
    "uniqueType": { "type": "string" }
  },
  "additionalProperties": true,
  "$defs": {
    "metadataValue": {
      "type": "object",
      "required": ["value"],
      "properties": {
        "value": { "type": "string" },
        "language": { "type": ["string", "null"] },
        "authority": { "type": ["string", "null"] },
        "confidence": { "type": ["integer", "null"] },
        "place": { "type": "integer" }
      }
    }
  }
}