[x3d-public] X3D JSON Javascript schema validators broken onrelative URIs. Issues filed.

[Don Brutzman]

[cc: community for general authoring interest]

On 2/2/2016 6:49 PM, John Carlson wrote:
> JSON looks fine now. What’s the purpose of mentioning each URI twice for ScalarDamper? Something to do with ExternProtos?

Four times actually: local then remote url for .x3d version, followed by local then remote url for .wrl version.

- local for efficiency/speed on local client or web server when using a collection.
- remote for interoperability when inspected in isolation (such as an email attachment).
- preferential retrieval of .x3d but .wrl also available for backwards compatibility with older players.

This is why _X3D url lists are better than html url values_. Linked content becomes portable.

More details on url best practices for X3D at

	X3D Scene Authoring Hints: URL Links
	http://www.web3d.org/x3d/content/examples/X3dSceneAuthoringHints.html#urls

"Eat your spinach" factor:  the X3D Validator will nag if your scene only has one url value.  If content is king, then good content is good to have.

	https://savage.nps.edu/X3dValidator


[...]
>> Also
>> http://www.web3d.org/x3d/content/examples/Basic/Followers/FollowerExternalPrototypeDeclarations.x3d
>>
>> <ExternProtoDeclare name='PositionDamper' url='"urn:inet:hersto.net:node:PositionDamper" "Dampers.wrl#PositionDamper" "http://www.hersto.net/Followers/Dampers.wrl#PositionDamper"'>
>
>> The URNs are questionable but they are defined by IETF and endorsed by W3C and included in VRML/X3D specifications.  Not sure if anyone uses them anymore.
>>
>> RFC 2141: URN Syntax
>> https://www.ietf.org/rfc/rfc2141.txt
>> URIs, URLs, and URNs: Clarifications and Recommendations 1.0
>
>> Report from the joint W3C/IETF URI Planning Interest Group
>> W3C Note 21 September 2001
>> https://www.w3.org/TR/uri-clarification
>
>> Roy and I got started on an X3D Regexes page.  We will return to that when other X3D Schema work in progress is complete.  Skeleton at
>
>> http://www.web3d.org/specifications/X3dRegularExpressions.html
>
>> If you look inside the X3D Schema, you will find a number of regexes for X3D datatypes in there already.  XML Schema does let you define a regex to validate special types, so this is a worthwhile future task.

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