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gnome-vfs-mime The GNOME system uses MIME types to classify content. Each MIME type on...

       The  GNOME  system uses MIME types to classify content.  Each MIME type
       on the GNOME system has a number of attributes attached to it.  Some of
       these attributes have a special meaning to the GNOME system.


MIME type of files

       There are two ways of classifying a file in the GNOME system: by match-
       ing their extension or a regular expression with their name or  by  its
       content.   GNOME applications use one of those two methods depending on
       speed contraints and the specific setup.  The MIME types  available  on
       the  system  can  be  configured at runtime by putting special files in
       either the GNOME MIME  directory  (/usr/share/mime-info)  or  the  user
       ~/.gnome/mime-info directory.


MIME type definition files.

       The  routines that classify a file by its name, use the contents of all
       of the files with the extension  .mime  from  the  /usr/share/mime-info
       directory and the ~/.gnome/mime-info to build the database for filename
       matching.  The latter is supported to enable  users  to  provide  their
       mime types to extend the system defaults.

       Application  that  wish  to  install  their own MIME types only need to
       install a file in this directory.

       The file /usr/share/mime-info/gnome.mime is special, as it contains the
       defaults  for  gnome,  and  is  read  first.   In  addition,  the  file
       ~/.gnome/mime-info/user.mime is read last.  This  will  guarantee  that
       there  is a way to set system defaults, and there is a way for the user
       to override them.  There is currently no way to tell anything about the
       order  of  the other files in those directories, nor is there anyway to
       override system defaults yet.

       The format is the following:

       mime-type-name
            ext[,priority]: ext1 ext2 ext3
            ext[,priority]: ext4
            regex[,priority]: regex1
            regex[,priority]: regex2

       where "mime-type-name" is a valid MIME type.  For example "text/plain".

       For example, for a vCalendar application, this file would be installed:

       ------ calendar.mime  -------
       application/v-calendar:
            ext: vcf
       -----------------------------


MIME key information

       To add keys to a MIME type, it is necessary to install a file with  the
       extension  .keys  in  the  /usr/share/mime-info  directory  or  in  the
       ~/.gnome/mime-info directory.  The former is for system-provided  mime-
       information  and the latter is to enable the user to extend the actions
       as provided by the system.

       mime-type-match:
            []key=value

       Above, the key is the key that is being defined and value is the  value
       we bind to it.  The optional [LANG] represents a language in which this
       definition is valid.  If this part is specified,  then  the  definition
       will only be valid if LANG matches the setting of the environment vari-
       able LANG.  The LANG setting is used to provide keys which can be  dis-
       played to the user in a localized way.

       This is an example to bind the key open to all of the mime-types match-
       ing   image/*   and   the   icon-filename   key   is   bound   to   the
       /opt/gimp/share/xcf.png value:

       image/*:
            open=gimp %f

       image/x-xcf:
               icon-filename=/opt/gimp/share/xcf.png

       This will make the GIMP the handler for the open action.  Files of type
       xcf would use the filename pointed in the icon-filename key.

       %f gets interpolated with the file name or the list of file names  that
       matched this mime-type.

       As  you  can  see from the example above, a .keys file does not need to
       provide all of the values, it can just provide or override some of  the
       actions.

       User  defined  bindings  in .keys file will take precedence over system
       installed files.


Special key used by the GNOME system

       The following keys are currently used in the GNOME desktop:

       open

              Open the file with this command.

       icon-filename

              The filename with the icon that  should  be  used  to  represent
              files of this type.

       view

              Command to view the file contents.

       ascii-view

              A  command  that  should be used to do an ascii-rendering of the
              file.  Used as a fallback by the filemanager if  a  view  action
              does not exist.
              file-manager view.  If present, invoking the  view  opertion  on
              the  file manager will use the value defined here instead of the
              value in "view".

       fm-ascii-view

              Fallback operation for the file manager as well.

       Those keys are also queried on the metadata (except in the cases  where
       the lookup would be too expensive).


AUTHOR

       This manual page has been written by Miguel de Icaza (miguel@gnu.org)

                                   GNOME 1.0                          GNOME(1)

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