anchor.diff:            '';
           };
           replication = {
  -          enable = mkOption {
  -            default = false;
  -            description = ''
  -              Whether to enable XtreemFS DIR replication plugin.
  -            '';
  -          };
  +          enable = mkEnableOption "XtreemFS DIR replication plugin";
             extraConfig = mkOption {
               example = ''
                 # participants of the replication including this replica
  
positive.code: 
      services.xtreemfs = {
  
        enable = mkOption {
          default = false;
          description = ''
            Whether to enable XtreemFS.
          '';
        };
  
        homeDir = mkOption {
          default = "/var/lib/xtreemfs";
  
negative.code:           '';
          };
          replication = {
            enable = mkEnableOption "XtreemFS MRC replication plugin";
            extraConfig = mkOption {
              example = ''
                # participants of the replication including this replica
  