Returns the value of $arg with leading and trailing whitespace removed, and
sequences of internal whitespace reduced to a single space character.
fn:normalize-space( xs:stringfn:normalize-space( $arg as xs:string?xs:stringIf 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 (.).
The expression fn:normalize-space(" The wealthy curled darlings
of our nation. ") returns "The wealthy curled darlings of our nation.".
The expression fn:normalize-space(()) returns "".
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)+
