Re: [rules-dev] Perhaps an undocumented feature of Backward Chaining?
ok I managed to re-create the test with:
"package org.drools.test \n" +
"import java.util.List\n" +
"import java.util.ArrayList\n" +
"global List list\n" +
"dialect \"mvel\"\n" +
"declare Person\n" +
" name : String\n" +
" likes : String\n" +
"end\n" +
"\n" +
"declare Location\n" +
" thing : String \n" +
" location : String \n" +
"end\n" +
"\n" +
"declare Edible\n" +
" thing : String\n" +
"end\n" +
"\n" +
"\n" +
"query hasFood( String x, String y ) \n" +
" Location(x, y;) " +
" or \n " +
" ( Location(z, y;) and ?hasFood(x, z;) )\n"+
"end\n" +
"\n" +
"rule look when \n" +
" Person( $l : likes ) \n" +
" hasFood( $l, 'kitchen'; )\n" +
"then\n" +
" list.add( 'kitchen has ' + $l );" +
"end\n" +
"rule go1 when\n" +
" String( this == 'go1') \n" +
"then\n" +
" insert( new Person('zool', 'peach') );\n"
+
" insert( new Location(\"table\",
\"kitchen\") );\n" +
" insert( new Location(\"peach\", \"table\")
);\n" +
"end\n" +
"\n";
On 22/06/2011 18:25, Mark Proctor wrote:
On 22/06/2011 16:39, Wolfgang Laun wrote:
> This is related to the example in 2.1.2.8., Backward Chaining.
>
> Using the same rules and queries given there, the sequence of fact insertions
>
> insert( new Here( "table" ) );
> insert( new Edible( "peach" ) );
> insert( new Location( "peach", "table" ) );
>
> results in nothing being seen and nothing being edible, whereas
>
> insert( new Edible( "peach" ) );
> insert( new Location( "peach", "table" ) );
> insert( new Here( "table" ) );
>
> results in the obvious and expected result.
>
> There is no difference w.r.t. using '?' in front of query names.
Take a look at the tests here, see if you can add the logic that you
think should works and doesn't and let us know. As far as I know
insertion order should not matter:
https://github.com/droolsjbpm/drools/blob/master/drools-compiler/src/test...
Mark
> -W
>
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