Is there a simple way to convert .xml files to .mp3 audio format?
It seems certainly possible to convert XML Files directly to MP3 Audio Files (.xml to .mp3 conversion). Such conversion attempts relate to users seeking ways to transform music scores saved as XML files (MusicXML) in order to create MIDI instrumental music files.
Use one of several music composition programs, such as MuseScore or Harmony Assistant, which allow users to export XML music scores in MP3 format.