illustrating the use of "contentEncoding" and "contentMediaType" examples

https://json-schema.org/
todos los ejemplos paso a paso  aqui https://json-schema.org/learn/getting-started-step-by-step.html

Here is an example schema, illustrating the use of "contentEncoding" and "contentMediaType":

{
    "type": "string",
    "contentEncoding": "base64",
    "contentMediaType": "image/png"
}

Instances described by this schema are expected to be strings, and their values should be interpretable as base64-encoded PNG images.

Another example:

{
    "type": "string",
    "contentMediaType": "text/html"
}

eng:This example describes a JWT that is MACed using the HMAC SHA-256 algorithm, and requires the "iss" and "exp" fields in its claim set.
spanish: Este ejemplo describe un JWT que se utiliza en MAC con el algoritmo HMAC SHA-256 y requiere los campos "iss" y "exp" en su conjunto de notificaciones. 

{ 
    "tipo": "cadena", 
    "contentMediaType": "aplicación/jwt", 
    "contentSchema": { 
        "tipo": "matriz", 
        "minItems": 2, 
        "prefixItems": [ 
            { 
                "const": { 
                    " tipo": "JWT", 
                    "alg": "HS256" 
                } 
            }, 
            { 
                "tipo": "objeto", 
                "requerido": ["iss", "exp"], 
                "propiedades": { 
                    "iss": {"tipo": "cadena"}, 
                    "exp": {"tipo": "entero"} 
                } 
            } 
        ]
    } 
}