Taylors Item Structure

{
  "$schema": "https://json-structure.org/meta/core/v0",
  "$id": "https://raw.githubusercontent.com/api-evangelist/taylors/main/json-structure/taylors-item-structure.json",
  "name": "Item",
  "description": "JSON Structure for a Koha catalog item from the Taylor's Library REST API.",
  "type": "object",
  "properties": {
    "item_id": { "type": "int64", "description": "Internal item identifier" },
    "biblio_id": { "type": "int64", "description": "Parent bibliographic record identifier" },
    "external_id": { "type": ["string", "null"], "maxLength": 20, "description": "Barcode" },
    "callnumber": { "type": ["string", "null"], "maxLength": 255 },
    "home_library_id": { "type": ["string", "null"], "maxLength": 10 },
    "holding_library_id": { "type": ["string", "null"], "maxLength": 10 },
    "item_type_id": { "type": ["string", "null"], "maxLength": 10 },
    "collection_code": { "type": ["string", "null"], "maxLength": 80 },
    "location": { "type": ["string", "null"], "maxLength": 80 },
    "copy_number": { "type": ["string", "null"], "maxLength": 32 },
    "acquisition_date": { "type": ["string", "null"], "format": "date" },
    "replacement_price": { "type": ["double", "null"] },
    "purchase_price": { "type": ["double", "null"] },
    "checkouts_count": { "type": ["int32", "null"] },
    "holds_count": { "type": ["int32", "null"] },
    "renewals_count": { "type": ["int32", "null"] },
    "not_for_loan_status": { "type": "int32" },
    "last_seen_date": { "type": ["string", "null"], "format": "datetime" },
    "uri": { "type": ["string", "null"] },
    "timestamp": { "type": "string", "format": "datetime" }
  },
  "required": ["biblio_id"]
}