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[protege-owl] How to infer the "Characteristic" Properties

Bill Dickinson dickinsw at
Sat Jan 19 21:34:39 PST 2008

I can't speak for the folks who write the reasoners, but, without intending 
to complicate this scenario, I wonder if you might also need to include a 
time of sympton onset.  Its seems reasonable that D1, D2, and D3 are all 
valid considerations for S3 which is shared by all three.  If S2 shows up 
later, re-eval would strongly infer D2, but wouldn't all three diseases be 
candidates if only S3 was presenting?   What if only S3 and S4 were present? 
(same conclusion).

Now S5 shows up - then we can rule out D1, I think, but can't decide if D2 
or D3 (or both) is correct until S2 shows up, or s7.  Maybe there is no time 
involved.  Maybe the syptoms all show up at once - I guess it depends on the 
disease.  Oh, well, just some random thoughts.  I think that inferences will 
change as the symptoms appear.  I understand you wish to define a 
"characteristic" of each disease based on the unique sysmptoms of each, but 
I think your "patient" is not going to present with, say, only S1, or only 
s2, or only S6 and S7 when there are other sysmptoms present AND some of 
them are shared by all diseases.


Bill Dickinson
----- Original Message ----- 
From: "SAPI" <m59sapi at>
To: <protege-owl at>
Sent: Saturday, January 19, 2008 10:04 PM
Subject: [protege-owl] How to infer the "Characteristic" Properties

> Hello there,
> I am doing a disease diagnosis system, I know how to make a class with N&S
> condtions so that inferrence engine will tell you what is the disease if I
> enter all the symptoms under the hasSymtoms property of the disease class.
> Now say I have three different diseases D1, D2 & D3 each has different
> symptoms has shown below:
> D1: S1, S2, S3, S4,
> D2: S2, S3, S4, S5
> D3: S3, S4, S5, S6, S7
> If the patient tell you he hasSymptoms S3 & S4, as these are the common
> symptoms across D1..D3, then these are useless, but if they tell you he 
> has
> S1, then you know he has D1 immediately, if he has S6 & S7, then he has 
> D3.
> So is there a way to infer the characteristic property of D1..D3 as 
> follows:
> D1: S1
> D2: S2
> D3: S6, S7
> Also is there any way to display a list of all possible symptoms, ie
> S1,S2,S3..S7?
> Any feedback will be highly appreciated.
> -- 
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