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From: Kilgallen@SpamCop.net (Larry Kilgallen)
Newsgroups: comp.lang.ada
Subject: Re: Progress on AdaOS
Date: 27 Aug 2001 18:30:26 -0500
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In article <3B8AB6C8.910130C8@san.rr.com>, Darren New <dnew@san.rr.com> writes:

>> Then we have
>> for example, types text, image, video, audio, program, data and
>> text/utf8, text/utf8/crlf, text/utf8/lf, text/utf8/psls, image/png,
>> image/tiff, image/tiff/lzw, data/word, data/word/7.0, etc. 
> 
> How about the type for Ada source files? Ada specification headers? Ada
> bodies? The type for an "Active Server Page" with Ada code embedded in
> HTML markup under control of CVS? And how do you determine which
> programs can read such? :-)

You determine which programs can read it by having the programs declare
that they can read it.  A user must be able to choose their "preferred"
reader for a particular type, if there are multiple possible readers.
But there are various types of "reading" there is the "edit" type and
the "compile" type for source files, but for object files there is
the "link" type and the "strip out symbol data" type.

>> So programs
>> like copy can deal with them on the raw data level,
> 
> Only in the most primitive of systems does that work. Does copy *really*
> deal with transfering text files across a TCP link between a unix box
> and a mac box? No, it's the device drivers.

On a VMS system the device driver has absolutely nothing to do with
copying files across a TCP link.  The interface between the user mode
program and the device driver is the socket interface (in the case of TCP).