CloudFront > Structures > Tag Tag¶ Structure Class¶ Tag dataclass ¶ Bases: _SerdeShape A complex type that contains Tag key and Tag value. Attributes¶ key instance-attribute ¶ key: str A string that contains Tag key. The string length should be between 1 and 128 characters. Valid characters include a-z, A-Z, 0-9, space, and the special characters _ - . : / = + @. value class-attribute instance-attribute ¶ value: str | None = ... A string that contains an optional Tag value. The string length should be between 0 and 256 characters. Valid characters include a-z, A-Z, 0-9, space, and the special characters _ - . : / = + @.