Balance JSONLD schema for refresh service. Balance field is nonNegativeInteger

balance.jsonld

{
    "@context": [
        {
            "@protected": true,
            "@version": 1.1,
            "id": "@id",
            "type": "@type",
            "Balance": {
                "@context": {
                    "@propagate": true,
                    "@protected": true,
                    "polygon-vocab": "urn:uuid:4cc38fdc-a412-4a43-b482-562d17982d5a#",
                    "xsd": "http://www.w3.org/2001/XMLSchema#",
                    "balance": {
                        "@id": "polygon-vocab:balance",
                        "@type": "xsd:nonNegativeInteger"
                    },
                    "address": {
                        "@id": "polygon-vocab:address",
                        "@type": "xsd:string"
                    }
                },
                "@id": "urn:uuid:88330643-3093-46a1-80dd-9028ebbce0a8"
            }
        }
    ]
}