[x3d-public] Note to browser vendors.

[Michalis Kamburelis]

AD 2 - Agreed, though note that VRML 97 and X3D (all encodings) differ here.

VRML 97: ( https://tecfa.unige.ch/guides/vrml/vrml97/spec/part1/concepts.html#4.6.2
)

"""
If multiple nodes are given the same name, each USE statement refers
to the closest node with the given name preceding it in either the
VRML file or prototype definition.
"""

X3D: ( https://www.web3d.org/specifications/X3Dv4Draft/ISO-IEC19775-1v4-CD/Part01/concepts.html#DEFL_USESemantics
)

"""
Node names shall be unique in the context within which the associated
DEF keyword occurs.
"""

To be clear, I think X3D (stricter) is saner. But still, a browser
that wants to handle all valid VRML (like view3dscene) can warn in
VRML with at most something like "Duplicate identifier specified for a
name. This is not portable to the X3D (VRML successor) so we recommend
to make it unique". Only in X3D the warning can be stronger
("Duplicate identifier, not allowed in X3D.").

Regards,
Michalis

czw., 13 lip 2023 o 01:11 John Carlson <yottzumm at gmail.com> napisał(a):
>
> 1) Warn for DEF value after USE value.   Some browsers do.  Some browsers choke.
> 2) Warn for repeated DEF values.  Probably unintended by author.
>
> That's all for now.
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