Integers in binary notation (i.e. binary integers) are formed using base 2, with the decimal digits 0 and 1 representing the values zero and one. Integers in binary notation are prefixed with the % symbol.
Here are some examples of valid binary integers:
%01100110 %0 %11111111
binary-integer = '%' binary-digit-sequence
binary-digit-sequence = binary-digit { binary-digit }
binary-digit = '0' | '1'