If I want to make a rule dynamic so i can use assert after the database file has been loaded, how do i do it? I'm using XSB Prolog at the moment, the file is something like this:
:- dynamic likes/2
likes(mary,tom)
when i try to consult the file with XSB i get an error:
? consult('D:\file.P).
not permitted to assert to static predicatelikes/2
forward continuation...blahblah
Any ideas?
The dynamic predicate works as you are expecting, so there is something else wrong if it is not working for you.
If test.P looks like this:
:- dynamic likes/2.
likes(mary,tom).
It can be consulted, and then more likes/2 facts can be asserted:
XSB Version 3.2 (Kopi Lewak) of March 15, 2009
[i686-pc-linux-gnu; mode: optimal; engine: slg-wam; scheduling: local; word size: 32]
| ?- consult('test.P').
[Compiling ./test]
[test compiled, cpu time used: 0.0440 seconds]
[test loaded]
yes
| ?- assert(likes(mary, bob)).
yes
| ?- likes(X,Y).
X = mary
Y = tom;
X = mary
Y = bob;