Logical or mathematical operations that apply the rules of Boolean algebra, in which the results take on one of two values, e.g. yes/no, true/false, 0/1. The operators AND, OR, NOT, NOR are used to search for specific attribute values in a single map layer.
Logical operations performed on sets. The result of these operations is either "TRUE" or "FALSE". The BOOLEAN operators include: 'and', 'or', 'not' (negation), 'xor' (exclusive or) and their combinations.