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   RE: DOM - Creating Documents

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  • From: Miles Sabin <msabin@cromwellmedia.co.uk>
  • To: "'Richard Anderson ( Vivid Creations )'" <rja@vivid-creations.com>
  • Date: Wed, 21 Apr 1999 13:59:02 +0100

Richard Anderson wrote,
> Miles Sabin wrote,
> > But then how do we get hold of a concrete instance 
> > of this factory interface so that we can call the 
> > method? We can't.
> I think W3C spec is 100% right in not specifying 
> this.

I think the W3C spec is 80% right in not specifying
it: language neutrality is a major goal.

Unfortunately it's not quite as clear cut as all that,
and your code fragments illustrate the problem.

> dim doc as DOMDocument
> set doc = new DOMDocument

> DOMDocument *pDoc;
> pDoc = createNewDOMDocument();

> CComPtr<IDOMElement> spDoc;
> spDoc.CreateInstance(...)

> Any reusable code starts from the point where it is 
> passed a DOMDocument pointer or reference.

This code isn't vendor neutral: it relies on a DOM
vendor specific (MS I presume) Document creation 
mechanism. Vendor neutrality is another important goal, 
and that's not addressed by the Level 1 spec.



Miles Sabin                          Cromwell Media
Internet Systems Architect           5/6 Glenthorne Mews
+44 (0)181 410 2230                  London, W6 0LJ
msabin@cromwellmedia.co.uk           England

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