Description: The function returns the sum, for each node in every argument node-set, of the result of converting the string-values of the node to a number. If some arguments are not node-sets, they are converted to numbers first.
Note that this definition differs from XPATH 1.0 standard, where sum() function must have exactly one argument of type node-set. It is important that other XPATH processors may quietly ignore all arguments except the first one, producing unexpected results.
Being called without arguments, sum() will return zero.
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