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
image/x-xpixmap                xpm              # X-pixmap Image File

        <match value="\x0a" type="string" offset="2"/>
        <match value="\x0d" type="string" offset="2"/>
        <match value="\x20" type="string" offset="2"/>
      </match>
    </magic>
    <glob pattern="*.ppm"/>
  </mime-type>
  <mime-type type="image/x-portable-arbitrarymap">
    <sub-class-of type="image/x-portable-anymap"/>
    <acronym>PAM</acronym>
    <_comment>UNIX Portable Bitmap Graphic Arbitrary Map</_comment>