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<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D">Oh… I misread the pseudo code. I missed that the if (age>60) is inside the if(location==”A”) rule. This is easy enough to fix. It’s would essentially be the
same thing as the otherwise, but in DRL:<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D"><o:p> </o:p></span></p>
<p class="MsoPlainText">rule 'Rule One'<o:p></o:p></p>
<p class="MsoPlainText">activation-group 'age-test'<o:p></o:p></p>
<p class="MsoPlainText">salience 300<o:p></o:p></p>
<p class="MsoPlainText">when<o:p></o:p></p>
<p class="MsoPlainText"> Person (location == 'A', age > 60 )<o:p></o:p></p>
<p class="MsoPlainText">Then<o:p></o:p></p>
<p class="MsoPlainText"> do_something();<o:p></o:p></p>
<p class="MsoPlainText">end<o:p></o:p></p>
<p class="MsoPlainText"><o:p> </o:p></p>
<p class="MsoPlainText">rule 'Rule Two'<o:p></o:p></p>
<p class="MsoPlainText">activation-group 'age-test'<o:p></o:p></p>
<p class="MsoPlainText">salience 200<o:p></o:p></p>
<p class="MsoPlainText">when<o:p></o:p></p>
<p class="MsoPlainText"> Person (location == 'B', age > 70 )<o:p></o:p></p>
<p class="MsoPlainText">Then<o:p></o:p></p>
<p class="MsoPlainText"> do_something();<o:p></o:p></p>
<p class="MsoPlainText">end<o:p></o:p></p>
<p class="MsoPlainText"><o:p> </o:p></p>
<p class="MsoPlainText">rule 'Rule Three'<o:p></o:p></p>
<p class="MsoPlainText">activation-group 'age-test'<o:p></o:p></p>
<p class="MsoPlainText">salience 100<o:p></o:p></p>
<p class="MsoPlainText">when<o:p></o:p></p>
<p class="MsoPlainText"> Person (location == 'C', age > 80 )<o:p></o:p></p>
<p class="MsoPlainText">Then<o:p></o:p></p>
<p class="MsoPlainText"> do_something();<o:p></o:p></p>
<p class="MsoPlainText">end<o:p></o:p></p>
<p class="MsoPlainText"><o:p> </o:p></p>
<p class="MsoPlainText">rule 'Rule Else'<o:p></o:p></p>
<p class="MsoPlainText">activation-group 'age-test'<o:p></o:p></p>
<p class="MsoPlainText">when<o:p></o:p></p>
<p class="MsoPlainText"> Person (location not in (‘A’,’B’,’C’), age > 65 )<o:p></o:p></p>
<p class="MsoPlainText">Then<o:p></o:p></p>
<p class="MsoPlainText"> do_something();<o:p></o:p></p>
<p class="MsoPlainText">end<o:p></o:p></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D">This is a good example why it can be difficult to model rules from procedural language. With a rule, you are reacting to a given condition, but with procedural
language waterfall logic, you automatically exclude conditions as you fall through the logic. With rules, there is not waterfall effect. You have to simulate the waterfall logic with explicit exclusions.<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D">This is best represented with a lot of if() but no else clauses in procedural language logic.<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D">Not the only rule I modified to make this work was my else rule.
<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D">Regards,<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D">Armand<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D"><o:p> </o:p></span></p>
<p class="MsoNormal"><b><span style="font-size:10.0pt;font-family:"Tahoma","sans-serif"">From:</span></b><span style="font-size:10.0pt;font-family:"Tahoma","sans-serif""> rules-users-bounces@lists.jboss.org [mailto:rules-users-bounces@lists.jboss.org]
<b>On Behalf Of </b>Ronald Albury<br>
<b>Sent:</b> Wednesday, November 23, 2011 11:22 AM<br>
<b>To:</b> rules-users@lists.jboss.org<br>
<b>Subject:</b> Re: [rules-users] multi-factor rule<o:p></o:p></span></p>
<p class="MsoNormal"><o:p> </o:p></p>
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<p class="MsoNormal">Armand <o:p></o:p></p>
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<p class="MsoNormal"> <o:p></o:p></p>
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<p class="MsoNormal">I don't think that works if location=='B' and age=68<o:p></o:p></p>
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<p class="MsoNormal"> <o:p></o:p></p>
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