Returns the normalized input string. "Normalization" means that the leading and trailing spaces are removed, and then each sequence of multiple consecutive whitespace characters are replaced by a single whitespace character. The Unicode character for "space" is (U+0020).
Built-in, C++, C#, Java, XQuery, XSLT 1.0, XSLT 2.0, XSLT 3.0.
The input string to normalize.
If the input string is The quick brown fox, the function returns The quick brown fox.