## Comments

    % This is a comment
    /* This is a
    multi-line comment */

## Numbers

    42
    3.1415

## Strings

    "This is a string."
    "This is a string \
    on multiple lines."
    "A string with \"quotes\" in it."
    "Another string with ""quotes"" in it."

## Example

    :- dynamic fibo/2.
    fibo(0, 1). fibo(1, 1).
    fibo(N, F) :-
    N >= 2, N1 is N - 1, N2 is N - 2,
    fibo(N1, F1), fibo(N2, F2), F is F1 + F2,
    assert(fibo(N,F):-!). % assert as first clause