The Number menu contains the following functions:
Number: Converts the argument to a number. For detailed information about the logic, see the XPath 1.0 specification.
Numeric Literal: Allows you to specify a literal number that you can then map to tree nodes or use as arguments for other functions.
Round: Returns the integer that is closest to the input argument.
Sum: Returns the sum of the result of converting the string values of each node in the argument node-set to a number.
Floor: Returns the largest integer that is not greater than the input argument.
Ceiling: Returns the smallest integer that is not less than the argument.