[x3d-public] Unexpected behaviour of X3D Validator; X3D regular expressions (regexes)

[Don Brutzman]

Am glad that the DOCTYPE checker caught this issue.  The program that performs the regex checks is

	X3dDoctypeChecker.java
	https://svn.code.sf.net/p/x3d/code/www.web3d.org/x3d/tools/X3dQualityAssurance/X3dValidator/src/java/org/web3d/x3d/tools/X3dDoctypeChecker.java

I've added the XML prolog and various DOCTYPE regexes there (plus a number of other X3D types) to

	X3D Regular Expressions (regexes)
	http://www.web3d.org/specifications/X3dRegularExpressions.html

I've also added the following warning to

	X3d Scene Authoring Hints: Validation
	http://www.web3d.org/x3d/content/examples/X3dSceneAuthoringHints.html#Validation

* /Warning/: some XML-based tools are exceedingly sensitive to capitalization, whitespace, and quotation mark type used in the XML declaration as part of the document prolog. Be sure to follow the following definitions exactly.

	XML declaration
	https://www.w3.org/TR/xml/#sec-prolog-dtd

Again thanks for reporting this error and resolution.

We'll review this progress on next week's X3D Working Group teleconference, Wednesday 08-0930 pacific.

	Web3D Teleconference Information
	http://www.web3d.org/member/teleconference-information


On 6/1/2018 6:01 AM, Frédéric Vogt wrote:
> Dear everyone,
> 
> Thanks for the insight. Vince, I confirm your find:
> 
> <?xml version=“1.0" encoding ="UTF-8"?>
> 
> fails the DOCTYPE tests, while:
> 
> <?xml version="1.0" encoding="UTF-8"?>
> 
> is a pass. The extra space right before the “=“ is the problem here. With this fix, my x3d files pass the X3D Validator (if small enough) and/or X3D Edit validations tests just fine. This doesn’t solve the limitations of the VTK X3D Exporter v0.9.1 I face by using mayavi, but at least I know how to properly fix the problems manually, now. This doesn’t fix the problem of the large file size incompatibility for older versions of Safari, but there’s nothing I can do there.
> 
> Thank you all for the support, very much appreciated. I’ll circulate a link to the scientific article once it gets out. Next step: put the model in VR.
> 
> Cheers,
> Frédéric

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