[x3d-public] MFString quoting [was: interesting sample]

[Andreas Plesch]

Hi Don,


> Date: Wed, 26 Apr 2017 10:37:54 -0700
> From: Don Brutzman <brutzman at nps.edu>
>
> Good discussion, and perhaps document clarity can be improved by
> additional prose and further examples.  Several mantis issues have
> suggested that.
>
> However that specification document - XML encoding for X3D - isn't wrong,
> per se.  Characters " and " are equivalent in XML, and that is why
> each of the proposed example variants actually work.
>
> Further if we even tried to distinguish between special-character
> representations in the X3D XML encoding, all XML parsers would ignore such
> distinctions.
>
> Lots more detail on handling string characters available in
>
>         _X3D for Web Authors_
>         http://x3dgraphics.com
>
>         Geometry Part 1: Primitives
>         http://x3dgraphics.com/slidesets/X3dForWebAuthors/
> Chapter02-GeometryPrimitives.pdf
>
>
"Not found". The pdf does not seem to be available anymore ?



>         X3D Example Archives: X3D for Web Authors, Chapter 02 Geometry
> Primitives (3 scenes)
>         http://x3dgraphics.com/examples/X3dForWebAuthors/
> Chapter02-GeometryPrimitives


http://x3dgraphics.com/examples/X3dForWebAuthors/Chapter02-GeometryPrimitives/TextSpecialCharactersIndex.html

First I thought both the cobweb and x3dom rendering are incorrect. But then
I saw that for the x3dom encoding, all original ampersands from entities
first characters got turned into a separate & entity:

<Text DEF='DefaultText' string='"Character entity substitutions:"
        "empty string \"\" skips a line:"
""         "apostrophe  '  is &apos;"
 "ampersand & is &amp;"         "quote mark  \"
 is &quot;"         "backslash \\ is X3D escape
character"         "double backslash \\\\ is X3D backslash \\
character"         "Pi Π is &#928; XML character
entity"'>

which I think makes the x3dom rendering correct.

It turns out the same conversion is happening to the .x3d file as well:
http://x3dgraphics.com/examples/X3dForWebAuthors/Chapter02-GeometryPrimitives/TextSpecialCharacters.x3d

If the cobweb (and x3dom) rendering is the intended rendering, then the
html on

http://x3dgraphics.com/examples/X3dForWebAuthors/Chapter02-GeometryPrimitives/TextSpecialCharactersIndex.html

should be probably changed to show the text MFString as above or here:
http://x3dgraphics.com/examples/X3dForWebAuthors/Chapter02-GeometryPrimitives/TextSpecialCharactersX3dom.xhtml


Andreas
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