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<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'>Thanks, Oana. I think I’m finally starting
to get a grip on this thing </span></font><font size=2 color=navy
face=Wingdings><span style='font-size:10.0pt;font-family:Wingdings;color:navy'>J</span></font><font
size=2 color=navy face=Arial><span style='font-size:10.0pt;font-family:Arial;
color:navy'>.<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'><o:p> </o:p></span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'><o:p> </o:p></span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'>Vlad<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'><o:p> </o:p></span></font></p>
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<p class=MsoNormal style='margin-left:36.0pt'><b><font size=2 face=Tahoma><span
style='font-size:10.0pt;font-family:Tahoma;font-weight:bold'>From:</span></font></b><font
size=2 face=Tahoma><span style='font-size:10.0pt;font-family:Tahoma'>
rules-users-bounces@lists.jboss.org
[mailto:rules-users-bounces@lists.jboss.org] <b><span style='font-weight:bold'>On
Behalf Of </span></b>nicolae oana<br>
<b><span style='font-weight:bold'>Sent:</span></b> 20 February 2007 03:38<br>
<b><span style='font-weight:bold'>To:</span></b> <st1:PersonName w:st="on">Rules
Users List</st1:PersonName><br>
<b><span style='font-weight:bold'>Subject:</span></b> Re: [rules-users] exists
+ normal column constraints - how many times a rule is cal led in the end????</span></font><o:p></o:p></p>
</div>
<p class=MsoNormal style='margin-left:36.0pt'><font size=3
face="Times New Roman"><span style='font-size:12.0pt'><o:p> </o:p></span></font></p>
<p class=MsoNormal style='margin-left:36.0pt'><font size=3
face="Times New Roman"><span style='font-size:12.0pt'>Vlad,<br>
<br>
exists Person(role == "parent") <br>
<br>
checks if in workingMemory is at least one Person fact having attribute
role == "parent", in both your examples.<br>
<br>
Your reasoning is correct: the four facts with role =="child" will
activate the rule. So, the result for your second example will be the same as
the first result, for your list of facts, no matter how you switch the columns.<br>
<br>
Regards,<br>
Oana<br>
<br>
<b><i><span style='font-weight:bold;font-style:italic'>"Olenin, Vladimir
(MOH)" <Vladimir.Olenin@moh.gov.on.ca></span></i></b> wrote:<o:p></o:p></span></font></p>
<div>
<p class=MsoNormal style='margin-left:36.0pt'><font size=2 face=Arial><span
style='font-size:10.0pt;font-family:Arial'>Hi,<u1:p></u1:p></span></font><o:p></o:p></p>
</div>
<div>
<p class=MsoNormal style='margin-left:36.0pt'><font size=2 face=Arial><span
style='font-size:10.0pt;font-family:Arial'><u1:p> </u1:p></span></font><o:p></o:p></p>
</div>
<div>
<p class=MsoNormal style='margin-left:36.0pt'><font size=2 face=Arial><span
style='font-size:10.0pt;font-family:Arial'>I’m not sure my understanding
of ‘existential quantifiers’ is correct. Hopefully, someone can
clear it up a bit…<u1:p></u1:p></span></font><o:p></o:p></p>
</div>
<div>
<p class=MsoNormal style='margin-left:36.0pt'><font size=2 face=Arial><span
style='font-size:10.0pt;font-family:Arial'><u1:p> </u1:p></span></font><o:p></o:p></p>
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<div>
<p class=MsoNormal style='margin-left:36.0pt'><font size=2 face=Arial><span
style='font-size:10.0pt;font-family:Arial'>Providing I have the following fact
class:<u1:p></u1:p></span></font><o:p></o:p></p>
</div>
<div>
<p class=MsoNormal style='margin-left:36.0pt'><font size=2 face=Arial><span
style='font-size:10.0pt;font-family:Arial'><u1:p> </u1:p></span></font><o:p></o:p></p>
</div>
<div>
<p class=MsoNormal style='margin-left:36.0pt'><font size=2 face=Arial><span
style='font-size:10.0pt;font-family:Arial'>Person(role: parent/child, name)<u1:p></u1:p></span></font><o:p></o:p></p>
</div>
<div>
<p class=MsoNormal style='margin-left:36.0pt'><font size=2 face=Arial><span
style='font-size:10.0pt;font-family:Arial'><u1:p> </u1:p></span></font><o:p></o:p></p>
</div>
<div>
<p class=MsoNormal style='margin-left:36.0pt'><font size=2 face=Arial><span
style='font-size:10.0pt;font-family:Arial'>And following facts:<u1:p></u1:p></span></font><o:p></o:p></p>
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<div>
<p class=MsoNormal style='margin-left:36.0pt'><font size=2 face=Arial><span
style='font-size:10.0pt;font-family:Arial'><u1:p> </u1:p></span></font><o:p></o:p></p>
</div>
<div>
<p class=MsoNormal style='margin-left:36.0pt'><font size=2 face=Arial><span
style='font-size:10.0pt;font-family:Arial'>1: parent, John<u1:p></u1:p></span></font><o:p></o:p></p>
</div>
<div>
<p class=MsoNormal style='margin-left:36.0pt'><font size=2 face=Arial><span
style='font-size:10.0pt;font-family:Arial'>2: parent, Alice<u1:p></u1:p></span></font><o:p></o:p></p>
</div>
<div>
<p class=MsoNormal style='margin-left:36.0pt'><font size=2 face=Arial><span
style='font-size:10.0pt;font-family:Arial'>3: parent, Steve<u1:p></u1:p></span></font><o:p></o:p></p>
</div>
<div>
<p class=MsoNormal style='margin-left:36.0pt'><font size=2 face=Arial><span
style='font-size:10.0pt;font-family:Arial'>4: parent, Jane<u1:p></u1:p></span></font><o:p></o:p></p>
</div>
<div>
<p class=MsoNormal style='margin-left:36.0pt'><font size=2 face=Arial><span
style='font-size:10.0pt;font-family:Arial'>5: child, Eric<u1:p></u1:p></span></font><o:p></o:p></p>
</div>
<div>
<p class=MsoNormal style='margin-left:36.0pt'><font size=2 face=Arial><span
style='font-size:10.0pt;font-family:Arial'>6: child, Rob<u1:p></u1:p></span></font><o:p></o:p></p>
</div>
<div>
<p class=MsoNormal style='margin-left:36.0pt'><font size=2 face=Arial><span
style='font-size:10.0pt;font-family:Arial'>7: child, May<u1:p></u1:p></span></font><o:p></o:p></p>
</div>
<div>
<p class=MsoNormal style='margin-left:36.0pt'><font size=2 face=Arial><span
style='font-size:10.0pt;font-family:Arial'>8: child, April<u1:p></u1:p></span></font><o:p></o:p></p>
</div>
<div>
<p class=MsoNormal style='margin-left:36.0pt'><font size=2 face=Arial><span
style='font-size:10.0pt;font-family:Arial'><u1:p> </u1:p></span></font><o:p></o:p></p>
</div>
<div>
<p class=MsoNormal style='margin-left:36.0pt'><font size=2 face=Arial><span
style='font-size:10.0pt;font-family:Arial'>I expect the rule<u1:p></u1:p></span></font><o:p></o:p></p>
</div>
<div>
<p class=MsoNormal style='margin-left:36.0pt'><font size=2 face=Arial><span
style='font-size:10.0pt;font-family:Arial'><u1:p> </u1:p></span></font><o:p></o:p></p>
</div>
<div>
<p class=MsoNormal style='margin-left:36.0pt'><font size=2 face=Arial><span
style='font-size:10.0pt;font-family:Arial'>Rule “iterate children if at
least one parent is found”<u1:p></u1:p></span></font><o:p></o:p></p>
</div>
<div>
<p class=MsoNormal style='margin-left:36.0pt'><font size=2 face=Arial><span
style='font-size:10.0pt;font-family:Arial'>When<u1:p></u1:p></span></font><o:p></o:p></p>
</div>
<div>
<p class=MsoNormal style='margin-left:36.0pt'><font size=2 face=Arial><span
style='font-size:10.0pt;font-family:Arial'>
exists Person(role == ‘parent’)<u1:p></u1:p></span></font><o:p></o:p></p>
</div>
<div>
<p class=MsoNormal style='margin-left:36.0pt'><font size=2 face=Arial><span
style='font-size:10.0pt;font-family:Arial'>
$child: Person(role == ‘child’)<u1:p></u1:p></span></font><o:p></o:p></p>
</div>
<div>
<p class=MsoNormal style='margin-left:36.0pt'><font size=2 face=Arial><span
style='font-size:10.0pt;font-family:Arial'>Then<u1:p></u1:p></span></font><o:p></o:p></p>
</div>
<div>
<p class=MsoNormal style='margin-left:36.0pt'><font size=2 face=Arial><span
style='font-size:10.0pt;font-family:Arial'>
// do smth for each $child if at least one parent is found<u1:p></u1:p></span></font><o:p></o:p></p>
</div>
<div>
<p class=MsoNormal style='margin-left:36.0pt'><font size=2 face=Arial><span
style='font-size:10.0pt;font-family:Arial'>End<u1:p></u1:p></span></font><o:p></o:p></p>
</div>
<div>
<p class=MsoNormal style='margin-left:36.0pt'><font size=2 face=Arial><span
style='font-size:10.0pt;font-family:Arial'><u1:p> </u1:p></span></font><o:p></o:p></p>
</div>
<div>
<p class=MsoNormal style='margin-left:36.0pt'><font size=2 face=Arial><span
style='font-size:10.0pt;font-family:Arial'><u1:p> </u1:p></span></font><o:p></o:p></p>
</div>
<div>
<p class=MsoNormal style='margin-left:36.0pt'><font size=2 face=Arial><span
style='font-size:10.0pt;font-family:Arial'>To iterate through all
‘child’ persons (facts 5 through 8), ie the action will be called
exactly 4 times. Is this correct? What would happen if I swap the order of the
conditions (with ‘parent exists’ constrain going _<i><span
style='font-style:italic'>after</span></i>_ ‘child’ constraint):<u1:p></u1:p></span></font><o:p></o:p></p>
</div>
<div>
<p class=MsoNormal style='margin-left:36.0pt'><font size=2 face=Arial><span
style='font-size:10.0pt;font-family:Arial'><u1:p> </u1:p></span></font><o:p></o:p></p>
</div>
<div>
<p class=MsoNormal style='margin-left:36.0pt'><font size=2 face=Arial><span
style='font-size:10.0pt;font-family:Arial'>When<u1:p></u1:p></span></font><o:p></o:p></p>
</div>
<div>
<p class=MsoNormal style='margin-left:36.0pt'><font size=2 face=Arial><span
style='font-size:10.0pt;font-family:Arial'>
$child: Person(role == ‘child’)<u1:p></u1:p></span></font><o:p></o:p></p>
</div>
<div>
<p class=MsoNormal style='margin-left:36.0pt'><font size=2 face=Arial><span
style='font-size:10.0pt;font-family:Arial'>
exists Person(role == ‘parent’)<u1:p></u1:p></span></font><o:p></o:p></p>
</div>
<div>
<p class=MsoNormal style='margin-left:36.0pt'><font size=2 face=Arial><span
style='font-size:10.0pt;font-family:Arial'><u1:p> </u1:p></span></font><o:p></o:p></p>
</div>
<div>
<p class=MsoNormal style='margin-left:36.0pt'><font size=2 face=Arial><span
style='font-size:10.0pt;font-family:Arial'>Thanks,<u1:p></u1:p></span></font><o:p></o:p></p>
</div>
<div>
<p class=MsoNormal style='margin-left:36.0pt'><font size=2 face=Arial><span
style='font-size:10.0pt;font-family:Arial'><u1:p> </u1:p></span></font><o:p></o:p></p>
</div>
<div>
<p class=MsoNormal style='margin-left:36.0pt'><font size=2 face=Arial><span
style='font-size:10.0pt;font-family:Arial'>Vlad<u1:p></u1:p></span></font><o:p></o:p></p>
</div>
<p class=MsoNormal style='margin-left:36.0pt'><font size=3
face="Times New Roman"><span style='font-size:12.0pt'>_______________________________________________<br>
rules-users mailing list<br>
rules-users@lists.jboss.org<br>
https://lists.jboss.org/mailman/listinfo/rules-users<o:p></o:p></span></font></p>
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<p style='margin-left:36.0pt'><font size=3 face="Times New Roman"><span
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