Definitions for **"Boolean operations"**

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.

(v) Local operations used to define the relationship between two geometric objects. Boolean operations between new and existing geometry are used extensively to modify solid models in 3-D modeling software.