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Re: Including other DTDs

including dtds
"Remco de Boer" <deboer@z...> writes:


> > <!ENTITY % VHG SYSTEM "http://www.vhg.org.uk/dtd/vhg.dtd">
> > %VHG;
> >
> > That's the proper way to compose DTD documents, _if_ they are designed
> > for it.
> Yes, that's how I include the above mentioned DTD in my own DTD. You mention
> that the DTDs should be designed for composition. I suppose you refer to
> collision of element names? At least that's the major problem I see with
> this way of including another DTD. And as far as I know DTDs are not
> namespace aware, so you can't just associate another namespace with the
> included DTD.

There is a by-now-pretty-standard design pattern for allowing
namespace flexibility on inclusion, developed independently by Dan
Connolly and myself.  See e.g. the schema document for W3C XML Schema [1]
for an example of how this is done.


[1] http://www.w3.org/2001/XMLSchema.xsd
  Henry S. Thompson, HCRC Language Technology Group, University of Edinburgh
          W3C Fellow 1999--2002, part-time member of W3C Team
     2 Buccleuch Place, Edinburgh EH8 9LW, SCOTLAND -- (44) 131 650-4440
	    Fax: (44) 131 650-4587, e-mail: ht@c...
		     URL: http://www.ltg.ed.ac.uk/~ht/
 [mail really from me _always_ has this .sig -- mail without it is forged spam]


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