1!  %float sequence
1?
1 %fixed sequence
2! REAL
2.1? %precision specification
2?
2 COMPLEX
2.1? %precision specification

float sequence:

1 FLOAT
2? -| precision specification |
3! DECIMAL
3.1? %precision specification
3?
3 BINARY
3.1? %precision specification

fixed sequence:

1 FIXED
2? -| precision specification |
3! DECIMAL
3.1? %precision specification
3?
3 BINARY
3.1? %precision specification
3.2! SIGNED
3.2?
3.2? UNSIGNED

precision specification:

1? PRECISION
2 %float precision
2 %fixed precision

float precision:

1 (number-of-digits)

fixed precision:

1 (number-of-digits
2? ,scaling-factor
3 )