[protege-discussion] making clause in algernon tab

[Rose S]

Hello there,
my question is about algernon tab for making clause
I want to know how can I specify 
that a value is kind of an instance in a clause?
for example if "biopsy" would be an instance
of "Drug" class in my project and "Pdrug" would
be a slot of "Patient" class how can
I mention that "biopsy" is an
instance of "Drug" in below clause?

(PDrug ?patient Biopsy)

if I enter this clause there would be this error:
whether Biopsy is of type [drug] is unknown
in (PDrug ?patient Biopsy)

Thanks in advance
Rose




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