Converts a sequence of octets to a hexBinary value.
octets-to-hexBinary($octents as xs:integer*) ➔ xs:hexBinary
The sequence of octets
This function takes a sequence of integers as input, and treats them as octets.
The integers must therefore all be in the range 0-255. The result of the function is the
xs:hexBinary value representing this sequence of octets.