This field contains 52 bits. See the Double-Precision Floating Point figure. The most and least significant bytes of a number are 0 and 3. These numbers refer to the mathematical positions of the bits but no t to their physical locations, which vary from medium to medium. See the Fixed-Length Opaque figure.
Opaque data is encoded as an unsigned integer and followed by the n bytes of the sequence.
The constant m would normally be found in a protocol specification. See the Variable-Length Opaque figure. Encoding a length n that is greater than the maximum described in the protocol specification causes an error. Each element size is a multiple of 4 bytes. Although the elements are of the same type, they may have different sizes.