{
    nickname: String // Types can be specified as functions...
        ,
    text: {
        type: 'string' // ...or they can be specified as strings.
            ,
        required: true // Makes the attribute required for the model to validate.
    },
    timestamp: {
        type: Date,
        validators: [ // Custom validator functions can be set in an array
            function (val) { // Each validator will be given the value of the field
                if (val > new Date()) {
                    return 'Timestamp can not be set to a future date.';
                }
            }
          ]
    },
    kind: {
        required: true,
        type: String,
        choices: [ // Enum-esque functionality. Forces the attribute to be
            'message' // one of these choices in order to be valid.
          , 'left'
          , 'joined'
          ]
    },
    _isStrict: true // Enables strict mode, which disallows arbitrary attributes
}