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| ANSI Common Lisp 21 Streams 21.2 Dictionary of Streams
21.2.30 stream-external-format | Function
  Syntax: stream-external-format stream format Arguments and Values: stream - a file stream. format - an external file format. Description: Returns an external file format designator for the stream. Examples:
       (with-open-file (stream "test" :direction :output)
         (stream-external-format stream))
       :DEFAULT
      OR:ISO8859/1-1987
      OR(:ASCII :SAIL)
      OR ACME::PROPRIETARY-FILE-FORMAT-17
      OR#<FILE-FORMAT :ISO646-1983 2343673>
See Also: the `:external-format` argument to the function open and the with-open-file macro. Notes: The format returned is not necessarily meaningful to other implementations. Allegro CL Implementation Details: None.

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