Path: utzoo!attcan!uunet!cs.utexas.edu!know!samsung!umich!terminator!boston.ifs.umich.edu!jwh
From: jwh@boston.ifs.umich.edu (Jim Howe)
Newsgroups: comp.text.sgml
Subject: Re: What about the DTD
Message-ID: <1990Oct4.135334.27960@terminator.cc.umich.edu>
Date: 4 Oct 90 13:53:34 GMT
References: <8149@mcshh.hanse.de>
Sender: usenet@terminator.cc.umich.edu (usenet news)
Reply-To: jwh@ifs.umich.edu
Organization: University of Michigan, IFS Project
Lines: 25

In article <8149@mcshh.hanse.de>, schiers@mcshh.hanse.de (Carsten
Schiers) writes:
|> Hello,
|> 
|> is the Document Type Definition (DTD) part of an SGML text interchange?
|>
|> [stuff deleted]
|> 
|> Is there something inside the SGML definition, which I don't have at
|> my desk, sorry, which tells me that a DTD is part of an SGML document?
|> What is the idea of the CALS standard with SGML text exchange?
|> 

SGML is a language for defining DTD's.  Since the DTD specifies the rules
used by your document it must be associated with your document in one
manner or another.  This can be done either by including the DTD at the
start of your document or referring to the DTD through the use of the 
PUBLIC identifier.  If PUBLIC is used, the document processor must know
how to process documents that conform to the DTD specified by the PUBLIC
keyword.  It could do this by knowing where to go to read the specified
DTD, or it could have the rules of the specified DTD built in.  

James W. Howe			   internet: jwh@ifs.umich.edu
University of Michigan             uucp:     uunet!mailrus!ifs.umich.edu!jwh
Ann Arbor, MI   48103-4943