# fn:normalize-space - XPath XQuery Reference

Returns the value of $arg with leading and trailing whitespace removed, and
            sequences of internal whitespace reduced to a single space character.deterministiccontext-dependentfocus-dependentdeterministiccontext-independentfocus-independentIf the value of $arg is the empty sequence, the function returns the
            zero-length string.The function returns a string constructed by stripping leading and trailing whitespace
            from the value of $arg, and replacing sequences of one or more adjacent
            whitespace characters with a single space, #x20.The whitespace characters are defined in the metasymbol S (Production 3) of .If no argument is supplied, then $arg defaults to the string value
            (calculated using fn:string) of the context item (.). fn:normalize-space(" The    wealthy curled darlings
                                        of    our    nation. ")"The wealthy curled darlings of our nation."fn:normalize-space(())""If no argument is supplied and the context item is absent then a dynamic error is raised: .The definition of whitespace is unchanged in . It is repeated here
         for convenience:S ::= (#x20 | #x9 | #xD | #xA)+