saxon:string-to-base64Binary($in as xs:string, $encoding as xs:string) ==> xs:base64Binary

This function takes as input a string and the name of a character encoding (for example "UTF8"). It encodes the contents of the string value as a sequence of bytes using a particular encoding, and returns the xs:base64Binary representation of this sequence of bytes.

For example, the call saxon:string-to-base64Binary("Dassel", "UTF8") returns the xs:base64Binary value whose lexical representation is "RGFzc2VsIA==".