Boolean Expressions

A boolean-expression designates true or false. CSL boolean expressions use conventional infix syntax:

[~]<term> [<binary-logical-operator> [~]<term>]*

A binary-logical-operator is one of the following:

• and

• or

Each term is one of the following:

• Boolean literal. See Boolean Literals.

• Identifier (must be boolean valued). See Identifiers and Literals.

• Function invocation (must be boolean valued). See Function Invocations.

• Arithmetic comparison. See below.

• Boolean expression. See Boolean Expressions.

An arithmetic-comparison has the following form:

<arithmetic-expression> <comparison-operator> <arithmetic-expression>

A comparison-operator is one of the following:

• > (greater than)

• >= (greater than or equal to)

• < (less than)

• <= (less than or equal to)

• == (equal to)

• <> (not equal to)

Boolean expressions can be grouped using parentheses.

Conventional precedence rules for conditional expressions are as follows:

• Parentheses (explicit expression nesting)

• ~ (logical negation)

• Arithmetic comparison

• and

• or

• Left to right (textual order)