When working with shared realms there are often properties that should only be updated by the server. It would be nice if it was possible to specify that in the schema, both to document the behaviour, and to prevent clients from accidentally modifying the properties:

var RequestSchema = {
    name: "Request".
    properties: {
        request: 'string',
        response: {type: 'data', optional: true, readOnly: true}
    }
}