[x3d-public] dual use of script tag in HTML environment

[Andreas Plesch]

On Fri, Nov 11, 2016 at 1:27 PM, Yves Piguet <yves.piguet at gmail.com> wrote:

> Sorry if this has already been discussed. Couldn't you define a
> namespace-like prefix for all elements, such as "x3d:"? Maybe optional for
> elements which don't cause a compatibility problem with element tag names
> already defined for other purposes.
>

Yes, that would be a solution and html5 custom elements need to have such
prefix with a minus instead of a colon. But since script is the only
element which is affected, there is a desire to avoid that in order to stay
x3d spec. conforming.

I do think a reasonable suggestion is to rename the x3d script node to
"X3DScript" or "x3d-Script" or "Program" since it supports other languages
as well. However, if this renaming becomes the standard all existing x3d
scenes become non-conforming which may be considered harmful although they
would still be conforming to the older version of spec.


> In HTML5, namespaces don't exist (see e.g. <https://dev.w3.org/html5/
> spec-LC/syntax.html#elements-0>): the actual tag name of X3D script
> elements would be "x3d:script". Script source code should be put in cdata
> fragments <https://dev.w3.org/html5/spec-LC/syntax.html#cdata-sections>.
>

No,  in html5 CDATA sections are only used in 'foreign content', see
https://dev.w3.org/html5/spec-LC/syntax.html#cdata-sections :

3. CDATA sections can only be used in foreign content (MathML or SVG)

and <script> is considered raw text content. In xhtml, one should use CDATA
for script source code.

In XHTML, a valid xml namespace would be declared and used.
>

For xhtml, there is no problem if the type attribute of the script node is
for example 'application/vrmlscript' .

What do you think about the fields attribute proposal for x3d scripts nodes
?

Thanks for chiming in, Andreas


> > On 11 Nov 2016, at 18:38, Andreas Plesch <andreasplesch at gmail.com>
> wrote:
> >
> > I am trying to make cobweb and cobweb_dom html5 compatible, so there is
> no requirement to use xhtml. xhtml is not used much at all and may face
> extinction,
> >
> > While I got cobweb to recognize the html5 DOM uppercased .nodeName (Box
> becomes BOX) and the lowercased attribute names (diffuseColor becomes
> diffusecolor) as equivalents to their realcased xml names, it turns out
> that there are deeper problems with the script node.
> >
> > The type='application/vrmlscript' work-around to avoid execution of the
> script by the web browser still applies.
> >
> > In html5 the script element's content is always CDATA and there is no
> need to use a CDATA tag. In fact, I am not sure if it is even recognized.
> >
> > https://wiki.whatwg.org/wiki/HTML_vs._XHTML#Element-specific_parsing
> >
> > While this is usually convenient, it also means that the <field></field>
> tags inside the script node are not recognized/parsed as child nodes as
> they are for xml/xhtml parsing but as character content.
> >
> > So script becomes a special case for x3d parsing since now the <field>
> tags are either already delivered as DOM child nodes or - in the case of
> html5 documents - they are delivered as .innerHTML or .textContent
> character data.
> >
> > The implication for x3d spec. is that it would be better to have the
> field definitions in an attribute rather as in child nodes. Something like
> > <script ... fields=' "inputOnly SFBool isOver" "outputOnly SFColor
> diffuseColor_changed" '>
> > That would be also more concise.
> > Perhaps both field attribute and field child nodes could be allowed with
> child nodes taking precedence, for compatibility.
> > I think this would affect only the XML encoding spec.
> >
> > I may try to come up with a little preprocessor script which finds all
> the field tags inside script nodes, converts them into actual DOM child
> nodes, appends those the script node, and removes them (or comments them
> out) from the textContent of the script node.
> >
> > Andreas
> >
> >
> > On Mon, Sep 26, 2016 at 2:35 AM, Don Brutzman <brutzman at nps.edu> wrote:
> > Andreas, I hope that everyone's relative silence over the weekend isn't
> interpreted as lack of interest!
> >
> > This is a really important step forward: HTML5 scripts coexisting with
> X3D scripts, both using javascript.
> >
> > Looking forward to a future X3D Working Group meeting to explore and
> begin documenting necessary approaches for this work in detail.  No doubt
> it will help us achieve important capabilities in X3D version 4.
> >
> > Once again, thanks for your many efforts.
> >
> > 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
> >
> >
> >
> > --
> > Andreas Plesch
> > 39 Barbara Rd.
> > Waltham, MA 02453
> > _______________________________________________
> > x3d-public mailing list
> > x3d-public at web3d.org
> > http://web3d.org/mailman/listinfo/x3d-public_web3d.org
>
>


-- 
Andreas Plesch
39 Barbara Rd.
Waltham, MA 02453
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