Comparison

This section explains the syntax of comparison operators that can be used to make Boolean comparison of values resulting from expressions. A Boolean comparison will have the result true or false.

If a comparison operator is prefixed with ! (exclamation mark), the result of the expression will be negated, e.g. the operator == is comparing whether two values are equal, while the operator !== is comparing whether two values are different.

?=== (Ends with)

This operator is used to check whether the value resulting from an expression is identical to, or ends with, a second value.

left-expression ?=== right-expression

Examples:

./@name ?=== ‘MOTOR’

Assuming the value of @name is "MOTOR", or "ELECTRIC MOTOR", the result of the above example will be true.

./@name ?=== ‘PUMP’

Assuming the value of @name is "Pump", or "Centrifugal Pump", the result of the above example will be false (because the letter casing is not the same).

?== (Ends with, ignore letter casing)

This operator is used to check whether the value resulting from an expression is identical to, or ends with, a second value (where the casing of the letters in the values are insignificant).

left-expression ?== right-expression

Examples:

./@name ?== ‘MOTOR’

Assuming the value of @name is "MOTOR", or "Electric Motor", the result of the above example will be true.

=== (Equals)

This operator is used to check whether the value resulting from an expression is identical to a second value.

left-expression === right-expression

Examples:

./@name === ‘MOTOR’

Assuming the value of @name is "MOTOR", the result of the above example will be true.

./@name === ‘PUMP’

Assuming the value of @name is "Pump", the result of the above example will be false (because the letter casing is not the same).

== (Equals, ignore letter casing)

This operator is used to check whether the value resulting from an expression is identical to a second value (where the casing of the letters in the values are insignificant).

left-expression == right-expression

Examples:

./@name == ‘MOTOR’

Assuming the value of @name is "MOTOR", or "Motor", the result of the above example will be true.

./@name !== ‘MOTOR’

Assuming the value of @name is "MOTOR", or "Motor", the result of the above example will be false (because the ! sign is negating the result, i.e. the expression compares whether @name is not equal "MOTOR").

===? (Starts with)

This operator is used to check whether the value resulting from an expression is identical to, or starts with, a second value.

left-expression ===? right-expression

Examples:

./@name ===? ‘MOTOR’

Assuming the value of @name is "MOTOR", or "MOTOR, Electrical", the result of the above example will be true.

./@name ?=== ‘PUMP’

Assuming the value of @name is "Pump", or "Pump, Centrifugal", the result of the above example will be false (because the letter casing is not the same).

==? (Starts with, ignore letter casing)

This operator is used to check whether the value resulting from an expression is identical to, or starts with, a second value (where the casing of the letters in the values are insignificant).

left-expression ==? right-expression

Examples:

Assuming the value of @name is "MOTOR", or "Motor, Electric", the result of the above example will be true.

Assuming the value of @name is "MOTOR", or "Motor, Electric", the result of the above example will be false (because the ! sign is negating the result, i.e. the expression compares whether @name not starts with "MOTOR").