image/x-cmu-raster             ras              #
image/x-portable-anymap        pnm              #
image/x-portable-bitmap        pbm              #
image/x-portable-graymap       pgm              #
image/x-portable-pixmap        ppm              #
image/x-rgb                    rgb              # RGB Image File
image/x-xbitmap                xbm              # X-bitmap Image File

    <sub-class-of type="image/x-portable-anymap"/>
    <acronym>PGM</acronym>
    <_comment>Portable Graymap Graphic</_comment>
    <magic priority="50">
      <match value="P2" type="string" offset="0"/>
      <match value="P5" type="string" offset="0"/>
      <match offset="0" type="string" value="\x50\x35\x0a"/>
    </magic>
    <glob pattern="*.pgm"/>
  </mime-type>

  <mime-type type="image/x-portable-pixmap">