Check if both of two expressions are logically true.
An AndExpr is a logical expression that is evaluated by
determining the effective
boolean value (ebv) of each of its operands. The value of the
AndExpr is then determined as follows:
and expression
|
ebv(op2) = true
|
ebv(op2) = false
|
error in ebv(op2) |
|---|---|---|---|
ebv(op1) = true
|
true
|
false
|
error |
ebv(op1) = false
|
false
|
false
|
false or error
|
| error in ebv(op1) | error | false or error
|
error |
Select all patients born in 1950 and living in Bradford:
for $a in input()/patient where $a/born = 1950 and $a//city = "Bradford" return $a
The following construct(s) refer to this construct:
