XPath/XQuery floor function


Rounds $arg downwards to a whole number.


$arg as xs:numeric?
) as xs:numeric?


This function is deterministic, context-independent, and focus-independent.


General rules: see .

The function returns the largest (closest to positive infinity) number with no fractional part that is not greater than the value of $arg.

For the four types xs:float, xs:double, xs:decimal and xs:integer, it is guaranteed that if the type of $arg is an instance of type T then the result will also be an instance of T. The result may also be an instance of a type derived from one of these four by restriction. For example, if $arg is an instance of xs:decimal then the result may be an instance of xs:integer.

For xs:float and xs:double arguments, if the argument is positive zero, then positive zero is returned. If the argument is negative zero, then negative zero is returned.


The expression fn:floor(10.5) returns 10.

The expression fn:floor(-10.5) returns -11.