XPath includes five functions that operate on numbers:

`floor(`

returns the greatest integer smaller than the number*number*)`ceiling(`

returns the smallest integer greater than the number*number*)`round(`

rounds the number to the nearest integer*number*)`sum(`

returns the sum of its arguments*number*)`format-number(`

returns the string form of a number formatted according to the specified format-string as if by Java 1.1's*number*,*format-string*)`java.text.DecimalFormat`

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