XPath provides some functions to aid the calculation of numeric values:

number()

Converts a string to a number, use it to be precise.

round()

Converts value to a number, round to nearest integer

• round(1.6) is 2; round(1.4) is 1; round(1.5) is 2

ceiling()

Converts value to a number, round up to next highest integer

• ceiling(1.6) is 2; ceiling(2) is 2; ceiling(-1.6) is -1

floor()

Converts value to a number, round down to next lowest integer

• floor(1.6) is 1; floor(2) is 2; floor(-1.6) is -2

sum()

Converts the string value of each node in the node-set to a number and sum these numbers

count()

Returns the number of nodes in the node-set