immutable ID (property)

{
    "$id": "https://schemas.optimade.org/defs/v1.2/properties/core/immutable_id",
    "$schema": "https://schemas.optimade.org/meta/v1.2/optimade/property_definition.json",
    "title": "immutable ID",
    "x-optimade-type": "string",
    "x-optimade-definition": {
        "label": "immutable_id_core",
        "kind": "property",
        "version": "1.2.0",
        "format": "1.2",
        "name": "immutable_id"
    },
    "type": [
        "string",
        "null"
    ],
    "description": "The entry's immutable ID (e.g., a UUID).\n\n**Requirements/Conventions:**\n\n- This is important for databases having preferred IDs that point to \"the latest version\" of a record, but still offer access to older variants.\n- This ID maps to the version-specific record, in case it changes in the future.",
    "examples": [
        "8bd3e750-b477-41a0-9b11-3a799f21b44f",
        "fjeiwoj,54;@=%<>#32"
    ],
    "x-optimade-unit": "inapplicable"
}