| width='120' | '''Signature'''
|<pre>string:levenshtein(
$string1 as xs:string,
$string2 as xs:string
) as xs:double</pre>
| width='120' | '''Signature'''
|<pre>string:format(
$format as xs:string, $items as item() ...
) as xs:string</pre>
|- valign="top"