tds: Mode and resolution location

 
 C.2.2 Mode and resolution location
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 We considered having the `mode' at the bottom of the font tree:
      texmf/fonts/pk/SUPPLIER/TYPEFACE/MODE/DPI/
 
    In this case, however, it is difficult to limit subdirectory
 searching to the mode required for a particular device.
 
    We then considered moving the `dpiNNN' up to below the mode:
      texmf/fonts/pk/MODE/DPI/SUPPLIER/TYPEFACE/
 
    But then it is not feasible to omit the `dpiNNN' level altogether on
 systems which can and do choose to use long filenames.