A Meta Condition is a statement which can be true or false.
Its truth depends on the truth of the sub-conditions it contains.
Example: Defining child is an infant with fever
Suppose we have a value condition “Child is an infant”;
Child is an infantage-in-years < 5
And suppose we had a second value condition “Child has fever”;
Child has fevertemperature > 37.5
We could define a meta-condition with both of these conditions as sub-conditions, and choosing to require ALL sub-conditions to be true.
We might name this meta-condition: “Child is an infant AND child has fever” or “Child is an infant with fever”
Child is an infant with feverChild is an infant (age-in-years < 5) AND Child has fever (temperature > 37.5)
Note that named condition which are defined but nowhere used are in a light font.
When conditions are in use (e.g. as subconditions of a meta condition), their names are presented with a regular font weight.
Meta Conditions can be sub-conditions
Meta conditions are conditions like any other, so they can be used as sub-conditions in defining other meta-conditions.
Once you have defined “Child is an infant with fever”, you can simply select that as a sub-condition in defining a further meta-condition
Paracetamol should be prescribedChild is an infant with fever (age-in-years < 5 AND temperature > 37.5) AND Child has no known allergy (..)
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