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I'm not certain that there's official documentation on this, but it looks like the feature has existed since 5.0.0:
</div><div><br></div><div><a href="https://issues.jboss.org/browse/JBRULES-1812">https://issues.jboss.org/browse/JBRULES-1812</a></div><div><br></div><div>The associated check-in to add the feature is also here:</div>
<div><div><br></div><div>https://github.com/droolsjbpm/drools/commit/9f0498ecaa118cf78a9760ab84056d4435b42d8b</div><div><br></div><div>I haven't worked extensively with it, but I believe that the extends keyword will join the LHS of the super rule with the LHS of the extended rule, further narrowing the criteria. From what I understand of the unit tests, the RHS of the child rule only is executed (though the RHS of the parent rule may execute anyway assuming the parent rule is enabled).</div><div><br></div><div>The unit tests for this feature are available here:</div><div><br></div><div><a href="https://github.com/droolsjbpm/drools/blob/9f0498ecaa118cf78a9760ab84056d4435b42d8b/drools-compiler/src/test/java/org/drools/integrationtests/MiscTest.java#L1077">https://github.com/droolsjbpm/drools/blob/9f0498ecaa118cf78a9760ab84056d4435b42d8b/drools-compiler/src/test/java/org/drools/integrationtests/MiscTest.java#L1077</a></div><div><br></div>--<div><span style="font-family: arial, sans-serif; background-color: rgb(255, 255, 255); ">Build Smarter Software.</span><span style="font-family: arial, sans-serif; background-color: rgb(255, 255, 255); "><br></span><span style="font-family: arial, sans-serif; background-color: rgb(255, 255, 255); "><br></span><span style="font-family: arial, sans-serif; background-color: rgb(255, 255, 255); ">Spantree Technology Group, LLC</span></div><div><span style="font-family: arial, sans-serif; background-color: rgb(255, 255, 255); ">813 W Randolph St, Suite 301, Chicago, IL<br></span><span style="font-family: arial, sans-serif; background-color: rgb(255, 255, 255); ">email:</span><span style="font-family: arial, sans-serif; background-color: rgb(255, 255, 255); "> </span><span style="font-family: arial, sans-serif; background-color: rgb(255, 255, 255); "><a href="mailto:cedric@spantree.net" target="_blank">cedric@spantree.net</a></span><span style="font-family: arial, sans-serif; background-color: rgb(255, 255, 255); "> </span><span style="font-family: arial, sans-serif; background-color: rgb(255, 255, 255); ">| phone:</span><span style="font-family: arial, sans-serif; background-color: rgb(255, 255, 255); "> </span><span style="font-family: arial, sans-serif; background-color: rgb(255, 255, 255); "><a href="tel:773.359.3865" value="+17733593865" target="_blank">773.359.3865</a></span><span style="font-family: arial, sans-serif; background-color: rgb(255, 255, 255); "><br></span></div><div><br></div></div>
<p style="color: #A0A0A8;">On Thursday, September 27, 2012 at 12:02 AM, Ming Fang wrote:</p>
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<span><div><div><div>Where can I find documentation on extending rules using the 'extends' keyword?</div><div>The official documentation doesn't even list that as a keyword.</div><div>I only found out about it by accident here <a href="http://blog.athico.com/2012/09/conditional-named-consequences-in.html">http://blog.athico.com/2012/09/conditional-named-consequences-in.html</a></div><div><br></div><div>_______________________________________________</div><div>rules-users mailing list</div><div><a href="mailto:rules-users@lists.jboss.org">rules-users@lists.jboss.org</a></div><div><a href="https://lists.jboss.org/mailman/listinfo/rules-users">https://lists.jboss.org/mailman/listinfo/rules-users</a></div></div></div></span>
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