Performing Arithmetic Operations

In queries, a number represents a floating-point number. A number can have any double-precision 64-bit format IEEE 754 value. This includes

You can use the following arithmetic operators in queries:

XML allows hyphens (-) in names. Consequently, the subtraction operator (-) typically needs to be preceded by white space. For example, foo-bar evaluates to a node set that contains the child elements named foo-bar. However, foo-bar evaluates to the difference between the result of converting the string value of the first foo child element to a number and the result of converting the string value of the first bar child to a number.

The mod operator is the same as the % operator in Java and ECMAScript. But it does not perform the same operation as the IEEE remainder operation, which returns the remainder from a rounding division.