[x3d-public] X3D XML DOCTYPE and Schema adjustments ScreenGroup and Mantis/spec issue for Layout

[John Carlson]

Interesting and important.  I already proposed an X3DParentNode that all
nodes with children, addChildren and removeChildren fields could inherit
from.  And of course, X3DGroupingNode would inherit from X3DParentNode.
X3DParentNode would inherit from X3DNode.

I’m not sure such a tight hierarchy is needed.

But I, too, would like to hear comments.

John
On Mon, Jul 28, 2025 at 11:41 PM Don Brutzman via x3d-public <
x3d-public at web3d.org> wrote:

> Found some small changes for XML Schema, DTD and specification during
> X3DJSAIL model debugging.
>
> X3D DTD update activity:
>> https://www.web3d.org/specifications/x3d-dtd-changelog.txt
>> 28 JUL 2025, brutzman
>> - (v3.2-4.0) add ScreenGroup to list of allowed GroupingNodes
>
>
> X3D XML Schema update activity:
>> https://www.web3d.org/specifications/x3d-schema-changelog.txt
>> 28 JUL 2025, brutzman
>> - (v3.2-4.0) add ScreenGroup to ChildContentModelFull group list of
>> allowed GroupingNodes
>> - (v3.2-4.0) note Mantis 1501 specification issue: LayoutGroup is
>> X3DNode, not an X3DGroupingNode
>
>
> Checking on corresponding changes revealed a mistaken node type in X3D
> Architecture.
>
>    - Mantis 1501: LayoutGroup needs to be X3DNode, not X3DGroupingNode
>    - https://mantis.web3d.org/view.php?id=1501
>
>  LayoutGroup needs to be X3DNode, not X3DGroupingNode
>
>
> * X3D Architecture, clause 36 Layout component, 36.4.2 LayoutGroup
>> *
>> https://www.web3d.org/specifications/X3Dv4Draft/ISO-IEC19775-1v4.1-CD/Part01/components/layout.html#LayoutGroup
>>
>
>     LayoutGroup : X3DGroupingNode {
>
>
> However the spec prose also says
>> * "The LayoutGroup is a grouping node whose children are related by a
>> common layout within a parent layout. Thus, a LayoutGroup can only be a
>> child of a LayoutLayer node or another LayoutGroup node."
>
>
> Some fields of X3DGroupingNode are provided, but others are not.
>
>
> A satisfactory replacement for X3DGroupingNode is X3DNode, which is less
>> restrictive and not contradictory.
>
>
> Change applied to draft spec for review purposes.
>
> 36.4.2 LayoutGroup
>
> LayoutGroup : X3DNode X3DGroupingNode {
>
>
> Further review and comment welcome prior to eventual editors' review.
>
> all the best, Don
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