anchor.diff:  HTTP archive. Therefore, a mapping has to be applied to come to the final URIs
   for files to be downloaded. For this purpose, a _uriMapping_ configuration is
   supported. The basic idea here is that the URI for a file is derived from the
  -URI declared in the content document or the meta data file applying the 
  +URI declared in the content document or the metadata file applying the
   following algorithm:
   
   * An optional prefix is removed from the original URI. This is useful for
  
positive.code: When loading data from an HTTP archive URI references have to be resolved in
  multiple ways:
  * The content document of the archive refers to the medium description file and
    the meta data file for each medium contained in the archive.
  * The meta data files list the (typically relative) URIs of the song files 
    belonging to this medium.
  
  These references are typically generated for local media archives. Because of
  
negative.code: `https://webdav.magentacloud.de/test-archive/testContent.json`
  
  This protocol is used by default if no protocol is specified in the
  configuration of an archive.
  
  === OneDrive
  This protocol allows access to data stored in a
  