"prefix": {
    "ex": "http://example.org/"
},
...
"entity": {
    "e1": {
        "ex:byteSize": {
            "$": "1034",
            "type": "xsd:positiveInteger"
        },
        "ex:compression": {
            "$": "82.5e-2",
            "type": "xsd:double"
        },
        "ex:content": {
            "$": "Y29udGVudCBoZXJl",
            "type": "xsd:base64Binary"
        }
    }
}