[x3d-public] id attribute proposal

[Andreas Plesch]

It turns out that SVG uses the SMIL animation model:

https://www.w3.org/TR/smil-animation/

It defines that animation does not affect the DOM value of an animated
property but a separate presentation value which is only accessible to the
animation runtime, and not the DOM. The specification does not go into what
values are used for rendering but the idea is certainly that the
presentation value is used. This would make it necessary for a renderer to
keep track of what attributes are currently animated by SVG and which ones
are not. Since the animate element is the only possible way to do this in
SVG, this is feasible. For the richer X3D scene graph, this would be much
harder and does not seem like a good model to follow at first glance.

Andreas
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