[x3d-public] Finding more than one use of a DEF in VRML - Chisel, duplicated DEF in proto

[John Carlson]

As mentioned on other thread:

https://www.web3d.org/x3d/content/X3dTooltips.html#ID

"*ID <https://www.w3.org/TR/REC-xml/#sec-attribute-types>* is a NMTOKEN
that is unique within the scene, corresponding to the DEF attribute in X3D.
 "

This would mean that the DEF attribute is unique within a scene?  Or no?

Help!   The sky is falling!

John

On Thu, Mar 26, 2020 at 9:26 AM Don Brutzman <brutzman at nps.edu> wrote:

> On 3/25/2020 7:11 PM, GPU Group wrote:
> > Chisel? "it was simply put in the public domain by Trapezium when they
> folded many years ago. They didn¹t specify any license" - Louka
> > http://dug9.users.sourceforge.net/web3d/temp/chisel-src.zip
>
> Also
>
> * X3D Resources: Conversions and Translation Tools
>
> https://www.web3d.org/x3d/content/examples/X3dResources.html#Conversions
>
> * 15. Chisel VRML Optimisation Tool
>    http://www2.hrp.no/vr/tools/chisel/install.htm
>
>    with autoinstaller
>    http://www2.hrp.no/vr/tools/chisel/install.htm
>
>    and documentation
>    http://www2.hrp.no/vr/tools/chisel/doc/index.html
>
>    provided by Halden Virtual Reality Centre.
>    http://www2.hrp.no/vr/about/index.html
>
>    Originally built by Trapezium and maintained by NIST.
>    http://ovrt.nist.gov/chisel.html
>    (link no longer working, hoping to find replacement)
>
> > But I suspect double-deffing isn't illegal. I think I've been through
> it, and different browsers honored the first or last definition.
> > -Doug
>
> Agreed.  Although it is legal in X3D abstract specification and in
> VRML/ClassicVRML encodings, it leads to validation difficulties in XML (and
> at some point JSON when JSON Schema is finished).
>
> Wondering if we should define a suggested practice for de-duplicating DEF
> names within a proto, e.g.
>
>         MyWhizzyProto includes DEF SomeDuplicatedName
>
> might get tidied up to globally rename
>
>         MyWhizzyProto includes DEF MyWhizzyProto.SomeDuplicatedName
>
> We might also apply this in the PrototypeExpander work if that gets
> revisited.
>
> Thoughts?
>
> > On Wed, Mar 25, 2020 at 7:43 PM John Carlson <yottzumm at gmail.com
> <mailto:yottzumm at gmail.com>> wrote:
> >
> >     That is, more than one DEF with the same value.
> >
> >     I realize that separate PROTOs may have the same DEF due to
> namespaces. Unfortunately writing a Unix script to find this takes massive
> brain power.
> >
> >     John
> >
> >     On Wed, Mar 25, 2020 at 8:37 PM John Carlson <yottzumm at gmail.com
> <mailto:yottzumm at gmail.com>> wrote:
> >
> >         I’m not particular looking for a vrml parser unless it catches
> double use of a DEF.
>
> 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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