Let me add my bit here - since I recently explored using the shadow tree
for the sue element itself:
By directly replacing "content" into the main tree you lose modularity.
Here is my situation embed an SVG file within a parent SVG file. No big
deal. But, what if you have styling and other defs which have similar id's
to the parent/sibling documents. The way it works in SVG is that the last
instance will override all others in terms of these id's - so in effect you
would probably "lose" some elements of the parent document . This applies
to any other elements too such as graphics elements/scripts/etc. So, if you
need to have "object oriented" SVG and associated styling/etc. this shadow
tree is the way to go. In terms of the overhead I think its there but not
that significant compared to the advantages.
Holger Will
<[EMAIL PROTECTED] To:
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Sent by: Subject: Re: [svg-developers]
Shadow Tree
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07/02/2005 12:01 PM
Please respond to
svg-developers
Mitzie schrieb:
> Hello,
> I've searched the net as well as the SVG 1.1 and 1.2 specs for an
> actual definition of a shadow tree. I've found the definition "For
> storage of the distributable files, we create "object trees" which
> mimic the organization of the
> source code directory /usr/src (see figure 2). There is one object
> tree for each different architecture or
> operating system. We called the directories where object files are
> stored, "Shadow Trees", because their
> structure is a projection of the source code tree.
> "
> however this really does not apply to the RCC rendering model used in
> SVG. Can anyone explain what a shadow tree is and why it is such an
> advantage to use it?
>
> Thanks.
>
Hi Mitzie
ok, let me try, if you have a <use> element, the used content gets
cloned and virtually appended to the <use> element.
this cloned content is a "shadow tree" of the original element that
gets <use>ed.
RCC or now sXBL is taking the concept of "shadow tree"s a step further,
by giving you more controll of the creation process and insertion points
of a "shadow tree".
hope im not to far off.
cheers
Holger
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