XPath Expressions

XPath supports numerical, equality, relational, and Boolean expressions.

Numerical Expressions

Numerical expressions are used to perform arithmetic operations on numbers.

Operator	Description	Example	Result
+	Addition	6 + 4	10
-	Subtraction	6 - 4	2
*	Multiplication	6 * 4	24
div	Division	8 div 4	2
mod	Modulus (division remainder)	5 mod 2	1

Note: XPath always converts each operand to a number before performing an arithmetic expression.

Equality Expressions

Equality expressions are used to test the equality between two values.

Operator	Description	Example	Result
=	Like (equal)	price=9.80	true (if price is 9.80)
!=	Not like (not equal)	price!=9.80	false

Testing Against a Node-Set

If the test value is tested for equality against a node-set, the result is true if the node-set contains any node with a value that matches the test value.

If the test value is tested for not equal against a node-set, the result is true if the node-set contains any node with a value that different from the test value.

The result is that the node-set can be equal and not equal at the same time !!!

Relational Expressions

Relational expressions are used to compare two values.

Operator	Description	Example	Result
<	Less than	price<9.80	false (if price is 9.80)
<=	Less or equal	price<=9.80	true
>	Greater than	price>9.80	false
>=	Greater or equal	price>=9.80	true

Note: XPath always converts each operand to a number before performing the evaluation.

Boolean Expressions

Relational expressions are used to compare two values.

Operator	Description	Example	Result
or	or	price=9.80 or price=9.70	true (if price is 9.80)
and	and	price<=9.80 and price=9.70	false

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