Skip to main content

6. IANA Considerations

6. IANA Considerations​

IANA has allocated the tags in Table 3 using this document as the specification reference. (The reserved value is for a future revision of typed array tags.)

The allocations were assigned from the "specification required" space (24..255) with the exception of 1040, which was assigned from the "first come first served" space (256..).

    +------+----------------------+----------------------------+
    |  Tag | Data Item            | Semantics                  |
    +======+======================+============================+
    |   40 | array of two arrays* | Multi-dimensional Array,   |
    |      |                      | row-major order            |
    +------+----------------------+----------------------------+
    |   41 | array                | Homogeneous Array          |
    +------+----------------------+----------------------------+
    |   64 | byte string          | uint8 Typed Array          |
    +------+----------------------+----------------------------+
    |   65 | byte string          | uint16, big endian, Typed  |
    |      |                      | Array                      |
    +------+----------------------+----------------------------+
    |   66 | byte string          | uint32, big endian, Typed  |
    |      |                      | Array                      |
    +------+----------------------+----------------------------+
    |   67 | byte string          | uint64, big endian, Typed  |
    |      |                      | Array                      |
    +------+----------------------+----------------------------+
    |   68 | byte string          | uint8 Typed Array, clamped |
    |      |                      | arithmetic                 |
    +------+----------------------+----------------------------+
    |   69 | byte string          | uint16, little endian,     |
    |      |                      | Typed Array                |
    +------+----------------------+----------------------------+
    |   70 | byte string          | uint32, little endian,     |
    |      |                      | Typed Array                |
    +------+----------------------+----------------------------+
    |   71 | byte string          | uint64, little endian,     |
    |      |                      | Typed Array                |
    +------+----------------------+----------------------------+
    |   72 | byte string          | sint8 Typed Array          |
    +------+----------------------+----------------------------+
    |   73 | byte string          | sint16, big endian, Typed  |
    |      |                      | Array                      |
    +------+----------------------+----------------------------+
    |   74 | byte string          | sint32, big endian, Typed  |
    |      |                      | Array                      |
    +------+----------------------+----------------------------+
    |   75 | byte string          | sint64, big endian, Typed  |
    |      |                      | Array                      |
    +------+----------------------+----------------------------+
    |   76 | byte string          | (reserved)                 |
    +------+----------------------+----------------------------+
    |   77 | byte string          | sint16, little endian,     |
    |      |                      | Typed Array                |
    +------+----------------------+----------------------------+
    |   78 | byte string          | sint32, little endian,     |
    |      |                      | Typed Array                |
    +------+----------------------+----------------------------+
    |   79 | byte string          | sint64, little endian,     |
    |      |                      | Typed Array                |
    +------+----------------------+----------------------------+
    |   80 | byte string          | IEEE 754 binary16, big     |
    |      |                      | endian, Typed Array        |
    +------+----------------------+----------------------------+
    |   81 | byte string          | IEEE 754 binary32, big     |
    |      |                      | endian, Typed Array        |
    +------+----------------------+----------------------------+
    |   82 | byte string          | IEEE 754 binary64, big     |
    |      |                      | endian, Typed Array        |
    +------+----------------------+----------------------------+
    |   83 | byte string          | IEEE 754 binary128, big    |
    |      |                      | endian, Typed Array        |
    +------+----------------------+----------------------------+
    |   84 | byte string          | IEEE 754 binary16, little  |
    |      |                      | endian, Typed Array        |
    +------+----------------------+----------------------------+
    |   85 | byte string          | IEEE 754 binary32, little  |
    |      |                      | endian, Typed Array        |
    +------+----------------------+----------------------------+
    |   86 | byte string          | IEEE 754 binary64, little  |
    |      |                      | endian, Typed Array        |
    +------+----------------------+----------------------------+
    |   87 | byte string          | IEEE 754 binary128, little |
    |      |                      | endian, Typed Array        |
    +------+----------------------+----------------------------+
    | 1040 | array of two arrays* | Multi-dimensional Array,   |
    |      |                      | column-major order         |
    +------+----------------------+----------------------------+

                      Table 3: Values for Tags

*40 or 1040 data item: The second element of the outer array in the data item is a native CBOR array (major type 4) or Typed Array (one of tag 64..87)

Last updated on