| SAXONICA | 
saxon:base64Binary-to-string($in as xs:base64Binary, $encoding as xs:string) ==> xs:string
This function takes as input an xs:base64Binary value and the name of a character
            encoding (for example "UTF8"). It interprets the contents of the base64 value as a sequence of bytes
            representing a character string in a particular encoding, and returns the corresponding string.
         
For example, the call saxon:base64Binary-to-string(xs:base64Binary("RGFzc2VsIA=="), "UTF8")
            returns the string "Dassel".