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- From: David Megginson <email@example.com>
- To: james anderson <firstname.lastname@example.org>
- Date: Fri, 12 Dec 1997 10:13:08 -0500
james anderson writes:
> we're trying to understand the necessary form for the external dtd
> in particular two questions have arisen.
> 1? since the external subset contains markup declarations only, it
> would appear that it establishes no constraint on the root element. is
> it legitimate to use the same dtd for various xml documents, each with a
> different root element?
Yes -- that's standard practice in the SGML world (you can use the
same external DTD for an entire book or for just one chapter of it).
> 2? among the example DTD's we've found, some begin with an <?xml ... >
> form. others don't. isn't that form excluded from being a PI and thus
> from being a markupdecl?
No, on two counts:
1) The grammatical production for markupdecl  explicitly includes
2) The <?xml...?> that you see at the beginning of the external subset
is not a processing instruction but a text declaration (which is
similar but not identical to an XML declaration). For example, if
my external subset were encoded in ISO Latin 1, I would be required
to put the following declaration at the top:
If it were in ASCII, however, I could just let the encoding default
All the best,
David Megginson email@example.com
Microstar Software Ltd. firstname.lastname@example.org
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