DSL has been designed to cover LHS and RHS. You have two (or, perhaps, three) options:

1) Define a simple DSL for the RHS, too. It could be as simple as
    [then][] print {what}=System.out.println( {what} );

2) Prefix Java code lines with '>' - the expander will simply keep the rest.

If you can come up with a good use case for applying the DSL expansion only to the LHS and let (or force) the rule author to write the RHS in Java code, you could propose a patch for an expansion option "LHS only".

-W




On 12 December 2011 02:10, Zhao Yi <zhaoyi0113@gmail.com> wrote:
I want to convert my drl to dsl and dslr. I found that if I choose using dsl,
I couldn't write java code in rules any more. I must translate everything in
dsl file. Can I combine dsl and drl in dslr file, like below rule. when I am
using dsl, I will get an error: "[10] Unable to expand:
System.out.println("add caculation start");"

rule "add caculation"
       agenda-group "add"
       no-loop true
       dialect "java"
       lock-on-active
       when
               $m: Whether exist event
       then
       System.out.println("add caculation start");
       System.out.println("add caculation end");

end


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