[x3d-public] Finding more than one use of a DEF in VRML - encoding/language portability

[John Carlson]

Can Leonard update his blog entry based on the various threads?

https://realism.com/blog/defuse-x3d-vs-dom

I think the important thing to get across is:

DEFs with duplicate field value may be duplicated within a scope (VRML).
DEFs with duplicate attribute value may not be duplicated within a scope
(XML, HTML).
I'm not really sure what the JSON requirements are, but someone should
probably go over the working draft.

Thanks,

John

On Thu, Mar 26, 2020 at 2:42 PM Don Brutzman <brutzman at nps.edu> wrote:

> Excellent question:
>
> On 3/26/2020 10:49 AM, John Carlson wrote:
> > It's important to note that this thread is mainly about DEF in VRML.
> Which may have different behavior than DEF in XML and JSON.   Do I have the
> whole story now, or is VRML dependent on XML types?
>
> The X3D Architecture defines baseline information for model
> rendering/behavior/interaction, regardless of how that model is saved.
>
> The various file encodings (ClassicVRML XML JSON Binary) and
> programming-language bindings (EcmaScript Java Python C/C#/C++ etc.) are
> expected to have equivalent expressive power to define an X3D model.  Other
> "non-standard" alternatives (TypeScript ObjectPascal etc.) should strive to
> follow the same path if consistent use is desired.
>
> Thus conversion or even "round trip" between any of the forms is expected
> to include all of the necessary information in the X3D model.
>
> Thus any time we find functional or expressive differences between
> ClassicVRML or XML or JSON or whatever, it is a deficiency and we should
> fix it.
>
> As we continue to succeed well on this challenge, X3D models become fully
> portable and consistent regardless of where they come from and where they
> go.
>
> Once again, with feeling: Have fun with X3D!  8)
>
> all the best, Don
> --
> Don Brutzman  Naval Postgraduate School, Code USW/Br
> brutzman at nps.edu
> Watkins 270,  MOVES Institute, Monterey CA 93943-5000 USA   +1.831.656.2149
> X3D graphics, virtual worlds, navy robotics
> http://faculty.nps.edu/brutzman
>
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