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NAME
     ttMedia - introduction to Media Exchange  messaging  conven-
     tions

DESCRIPTION
     The Media conventions allow a tool to  be  a  container  for
     arbitrary  media, or to be a media player/editor that can be
     driven from such a container.   These  conventions  allow  a
     container  application  to compose, display, edit, print, or
     transform a document of an  arbitrary  media  type,  without
     understanding  anything about the format of that media type.
     ToolTalk routes container requests to the  user's  preferred
     tool  for the given media type and operation.  This includes
     routing the request to an already-running  instance  of  the
     tool  if  that  instance  is  best-positioned  to handle the
     request.

LIST OF MESSAGES
     [file]   Deposit(     in        mediaType   contents,
                           [in       bufferID    beingDeposited
                           in        messageID   commission] );
     [file]   Display(     in        mediaType   contents,
                           [in       messageID   conterfoil]
                           [in       title       docName] );
     [file]   Edit(        [in]out   mediaType   contents,
                           [in       messageID   counterfoil]
                           [in       title       docName ])
     [file]   Mail(        in        mediaType   contents );
     [file]   Mail(        out       mediaType   contents
                           [in       title       docName] );
     [file]   Mail(        inout     mediaType   contents
                           [in       title       docName] );
     [file]   Print(       in        mediaType   contents,
                           in        boolean     inquisitive,
                           in        boolean     covert
     [file]   Translate(   in        mediaType   contents,
                           out       mediaType   output,
                           in        boolean     inquisitive,
                           in        boolean     covert
                           [in       messageID   counterfoil] );

DEFINITIONS
  document
     A vector of bytes with an associated mediaType.

  mediaType
     The name of a media format.  The media type  of  a  document
     allows  messages about that document to be dispatched to the
     right tool.  Standard media types include:

     ISO_Latin_1          ISO 8859-1 (+TAB+NEWLINE)         ISO
     EUC                  Multi-National Lang. Supplement   AT&T
     PostScript           PostScript Lang. Ref. Manual      Adobe
     Sun_Raster           rasterfile(5)                     Sun
     TIFF                 "TIFF Rev. 5" Technical Memo      Aldus
     GIF                  Graphics Interchange Format       CompuServe
     XPM                  XPM -- The X PixMap Format        Groupe Bull
     JPEG                                                   ISO-CCITT
     JPEG_Movie                                             Parallax
     Sun_Audio            audio_intro(3), audio_hdr(3)      Sun
     RFC_822_Message      RFC 822                           NIC
     MIME_Message         RFC MIME                          NIC
     UNIX_Mail_Folder
     RTF                  MS Word Technical Reference       Microsoft
     EPS
     Sun_CM_Appointment                                     Sun

ERRORS
     1300 TT_MEDIA_ERR_SIZE
          The specified size was too big or too small

     1301 TT_MEDIA_ERR_FORMAT
          The data do not conform to their alleged format

NOTES
     It is possible to extract from the ToolTalk types database a
     list of the installed media types.

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