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The syntax of some
XPath functions include the question mark (?) character and the
asterisk (*):
A question mark that follows a function parameter indicates
that the parameter is optional. For example, the object parameter
of the number function is optional: number(object?).
An asterisk that follows a function parameter indicates that
the function can take zero or more values for the parameter. For
example, zero or more string values can be provided as the value
for the third string parameter in the concat function,: concat(string, string, string*).
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