Improved schema

schema.json

{
    "$schema": "http://json-schema.org/draft-04/schema#",
    "description": "",
    "type": "object",
    "patternProperties": {
        "^(price|barcode|sku)$": {
        "anyOf":[
            {
            "type": "string"
            },
            {
            "type":"integer"
            }
        ]
        }
    },
    "additionalProperties": false,
    "properties": {
        "name": {
        "type": "string"
        }
    },
    "required":[
        "sku"
    ]
}