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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'>I’m having a hard time understanding
the syntax in the conditional or left hand side of the DRL. Is it
acceptable to use dot notation in the LHS? Is there a better way to
compare fields on different objects? </span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'> </span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'>In the example below, I get an error “Unable
to find class $d1. What limitations are there syntactically on the left
hand side? Any help would be greatly appreciated. I have looked at
all the examples and have googled the problem and don’t seem to find the
answer.</span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'> </span></font></p>
<p class=MsoNormal style='text-autospace:none'><b><font size=2 color="#960000"
face="Courier New"><span style='font-size:10.0pt;font-family:"Courier New";
color:#960000;font-weight:bold'>package</span></font></b><font size=2
face="Courier New"><span style='font-size:10.0pt;font-family:"Courier New"'> com.rules</span></font></p>
<p class=MsoNormal style='text-autospace:none'><font size=2 color=black
face="Courier New"><span style='font-size:10.0pt;font-family:"Courier New";
color:windowtext'> </span></font></p>
<p class=MsoNormal style='text-autospace:none'><font size=2 color=olive
face="Courier New"><span style='font-size:10.0pt;font-family:"Courier New";
color:olive'>#list any import classes here.</span></font></p>
<p class=MsoNormal style='text-autospace:none'><b><font size=2 color="#960000"
face="Courier New"><span style='font-size:10.0pt;font-family:"Courier New";
color:#960000;font-weight:bold'>import</span></font></b><font size=2
face="Courier New"><span style='font-size:10.0pt;font-family:"Courier New"'>
com.validate.Date1</span></font></p>
<p class=MsoNormal style='text-autospace:none'><b><font size=2 color="#960000"
face="Courier New"><span style='font-size:10.0pt;font-family:"Courier New";
color:#960000;font-weight:bold'>import</span></font></b><font size=2
face="Courier New"><span style='font-size:10.0pt;font-family:"Courier New"'>
com.validate.Date2</span></font></p>
<p class=MsoNormal style='text-autospace:none'><b><font size=2 color="#960000"
face="Courier New"><span style='font-size:10.0pt;font-family:"Courier New";
color:#960000;font-weight:bold'>import</span></font></b><font size=2
face="Courier New"><span style='font-size:10.0pt;font-family:"Courier New"'> java.util.Date</span></font></p>
<p class=MsoNormal style='text-autospace:none'><font size=2 color=black
face="Courier New"><span style='font-size:10.0pt;font-family:"Courier New";
color:windowtext'> </span></font></p>
<p class=MsoNormal style='text-autospace:none'><font size=2 color=olive
face="Courier New"><span style='font-size:10.0pt;font-family:"Courier New";
color:olive'>#declare any global variables here</span></font></p>
<p class=MsoNormal style='text-autospace:none'><font size=2 color=black
face="Courier New"><span style='font-size:10.0pt;font-family:"Courier New";
color:windowtext'> </span></font></p>
<p class=MsoNormal style='text-autospace:none'><b><font size=2 color="#960000"
face="Courier New"><span style='font-size:10.0pt;font-family:"Courier New";
color:#960000;font-weight:bold'>rule</span></font></b><font size=2
face="Courier New"><span style='font-size:10.0pt;font-family:"Courier New"'> </span></font><font
size=2 color=green face="Courier New"><span style='font-size:10.0pt;font-family:
"Courier New";color:green'>"Your First Rule"</span></font></p>
<p class=MsoNormal style='text-autospace:none'><font size=2 color=black
face="Courier New"><span style='font-size:10.0pt;font-family:"Courier New"'>
</span></font></p>
<p class=MsoNormal style='text-autospace:none'><font size=2 color=black
face="Courier New"><span style='font-size:10.0pt;font-family:"Courier New"'> </span></font><b><font
size=2 color="#960000" face="Courier New"><span style='font-size:10.0pt;
font-family:"Courier New";color:#960000;font-weight:bold'>when</span></font></b><font
size=2 face="Courier New"><span style='font-size:10.0pt;font-family:"Courier New"'>
</span></font></p>
<p class=MsoNormal style='text-autospace:none'><font size=2 color=black
face="Courier New"><span style='font-size:10.0pt;font-family:"Courier New"'> $d1
: Date1() </span></font></p>
<p class=MsoNormal style='text-autospace:none'><font size=2 color=black
face="Courier New"><span style='font-size:10.0pt;font-family:"Courier New"'>
$d2 : Date2()</span></font></p>
<p class=MsoNormal style='text-autospace:none'><font size=2 color=black
face="Courier New"><span style='font-size:10.0pt;font-family:"Courier New"'> $d2
: Date2(beginDate > $d1.getEndDate)</span></font></p>
<p class=MsoNormal style='text-autospace:none'><font size=2 color=black
face="Courier New"><span style='font-size:10.0pt;font-family:"Courier New"'> </span></font><b><font
size=2 color="#960000" face="Courier New"><span style='font-size:10.0pt;
font-family:"Courier New";color:#960000;font-weight:bold'>then</span></font></b><font
size=2 face="Courier New"><span style='font-size:10.0pt;font-family:"Courier New"'>
</span></font></p>
<p class=MsoNormal style='text-autospace:none'><font size=2 color=black
face="Courier New"><span style='font-size:10.0pt;font-family:"Courier New"'> </span></font><font
size=2 color=olive face="Courier New"><span style='font-size:10.0pt;font-family:
"Courier New";color:olive'>#actions</span></font></p>
<p class=MsoNormal style='text-autospace:none'><font size=2 color=black
face="Courier New"><span style='font-size:10.0pt;font-family:"Courier New"'> System.out.println(</span></font><font
size=2 color=green face="Courier New"><span style='font-size:10.0pt;font-family:
"Courier New";color:green'>"do something"</span></font><font size=2
face="Courier New"><span style='font-size:10.0pt;font-family:"Courier New"'>);</span></font></p>
<p class=MsoNormal style='text-autospace:none'><b><font size=2 color="#960000"
face="Courier New"><span style='font-size:10.0pt;font-family:"Courier New";
color:#960000;font-weight:bold'>end</span></font></b></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'> </span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'>Best regards,</span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'> </span></font></p>
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<p class=MsoNormal><font size=2 color=black face=Arial><span style='font-size:
10.0pt;font-family:Arial'>Robert Costello</span></font></p>
<p class=MsoNormal><font size=3 color=black face="Times New Roman"><span
style='font-size:12.0pt'> </span></font></p>
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