core.json

{
    "$schema": "https://json-schema.org/draft/next/schema",
    "$id": "https://json-schema.org/draft/next/meta/core",
    "$vocabulary": {
        "https://json-schema.org/draft/next/vocab/core": true
    },
    "$dynamicAnchor": "meta",

    "title": "Core vocabulary meta-schema",
    "type": ["object", "boolean"],
    "properties": {
        "$id": {
            "type": "string",
            "format": "iri-reference",
            "$comment": "Non-empty fragments not allowed.",
            "pattern": "^[^#]*#?$"
        },
        "$schema": { "$ref": "#/$defs/iriString" },
        "$ref": { "$ref": "#/$defs/iriReferenceToSchemaString" },
        "$anchor": { "$ref": "#/$defs/anchorString" },
        "$dynamicRef": { "$ref": "#/$defs/iriReferenceToSchemaString" },
        "$dynamicAnchor": { "$ref": "#/$defs/anchorString" },
        "$vocabulary": {
            "type": "object",
            "propertyNames": { "$ref": "#/$defs/iriString" },
            "additionalProperties": {
                "type": "boolean"
            }
        },
        "$comment": {
            "type": "string"
        },
        "$defs": {
            "type": "object",
            "additionalProperties": { "$dynamicRef": "#meta" }
        }
    },
    "$defs": {
        "anchorString": {
            "type": "string",
            "pattern": "^[A-Za-z_][-A-Za-z0-9._]*$"
        },
        "iriString": {
            "type": "string",
            "format": "iri"
        },
        "iriReferenceToSchemaString": {
            "type": "string",
            "format": "iri-reference",
            "$comment": "any fragment must be empty, or match anchor or json-pointer syntax",
            "pattern": "^[^#]*(#([A-Za-z_][-A-Za-z0-9.:_]*|/([^~]|~[01])*))?$"
        }
    }
}