The device filter expression encodes the actual filter conditions. It is built from basic device filter term types that are combined with Boolean operators and form a Boolean expression tree.
Following logical operators are supported:
•AND: Joins two or more device filter terms or logical operators with a Boolean AND operation.
•OR: Joins two or more device filter terms with a Boolean OR operation.
Figure 4 shows examples of Boolean expression trees and their equivalent as logical expression.
Note: The structure o the expression defines operator precedence. |
Figure 4: Device filter expression tree examples.
