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Number Functions 

The XML Path Language (XPath) syntax supports Number functions that return strings or numbers and can be used with comparison operators in filter patterns.

ceiling

Returns the smallest integer that is not less than the argument.

floor

Returns the largest integer that is not greater than the argument.

number

Converts the argument to a number.

round

Returns an integer closest in value to the argument.

sum

Returns the sum of all nodes in the node-set. Each node is first converted to a number value before summing.

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