1                   2                   3
  0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
 +---------------+---------------+-------------------------------+
 |     Type=0x15 |     Length    |           Unassigned          |
 +---------------+---------------+-------------------------------+
 |     Kind #1   |     Kind #2   |           ...                 |
 +---------------+---------------+-------------------------------+
 /                              ...                              /
 /                                                               /
 +---------------------------------------------------------------+