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Re: Multiple inheritance used in the SVG DOM interfaces.

From: Jon Ferraiolo <jferraio@adobe.com>
Date: Sat, 11 Aug 2001 11:04:07 -0700
Message-Id: <>
To: jst@netscape.com (Johnny Stenback)
Cc: Chris Lilley <chris@w3.org>, www-svg@w3.org
Adobe takes the SVG IDL and runs a flattening process to expand all base 
classes before sending it through the MS COM tools, such as midl. This is 
really a very simple process. If the W3C were to provide COM bindings for 
its various DOMs, this is the approach that would be used in the COM bindings.

Note that W3C documented ECMAScript bindings in effect do the same sort of 
flattening because ECMAScript doesn't even support single inheritance. For 
example, here is an excerpt from the ECMAScript language binding for DOM 
level 2 core for the Element interface:

Object Element
Element has the all the properties and methods of the Node object as well 
as the properties and methods defined below. ....

There is indeed a viable approach to implementing the SVG DOM in COM 
environments and at least one implementation has successfully implemented 
this approach. The flattening approach used to implement COM interfaces 
matches the approach used to implement ECMAScript interfaces.

Jon Ferraiolo
SVG 1.0 Editor

At 03:23 PM 8/10/01 -0700, Johnny Stenback wrote:
>Chris Lilley wrote:
>>Johnny Stenback wrote:
>>>Does silence mean that nobody cares if the SVG DOM interfaces are
>>>un-implementable in COM like environments?
>>No, it means that there was some discussion recently between Philippe, 
>>Jon and myself and that it turns out that Adobe has in fact implemented 
>>SVG DOM in a COM environment. I have asked them for some more details of
>Any resolution to this yet? I see the SVG spec moving forward, but I don't 
>see how that can happen w/o resolving this issue?
Received on Saturday, 11 August 2001 14:06:07 UTC

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