[x3d-public] No mutable maps in Saxon; DEF/USE solution?

[John Carlson]

path() in XSLT:
https://stackoverflow.com/questions/38602029/generate-xpath-from-node-using-xslt-2#:~:text=Comments,-Add%20a%20comment&text=A%20couple%20of%20points.,element%20names%20are%20context%2Dfree.

Read Michael Kay’s comment before using his code….

On Sat, Mar 28, 2026 at 2:59 AM John Carlson <yottzumm at gmail.com> wrote:

> The issue with why there’s no DEF/USE reordering in X3DJSAIL and X3DPSAIL
> apparently stems from Saxon not being able to handle mutable maps/lookup
> tables.  So let’s build a map per scene, but don’t build it in the
> X3dTo….xslt, but as a generated XSLT map, perhaps in another file, XSLT
> or not.
>
> Perhaps we need to write a preprocessor to map DEF/USE values to a list of
> XPath expressions in a file per XML scene which allows the DEF node and
> first USE node for a particular DEF value to be found with an XPath.  If
> the DEF node isn’t the first XPath for a given DEF/USE value, then the DEF
> node is swapped with the first USE node with the same DEF value.  We can
> probably export this as a stylesheet per XML scene.
>
> Will this actually work?
>
> Criticism welcome!
>
> I’d say Don could probably whip this up really quick if he can retrieve
> XPaths for all DEF and USE nodes in a scene.  Maybe Vince could as well.
> What implementation language do we use?
>
> Do PROTOs affect this?
>
> Sorry for all the emails today!
>
> I finally got outside the box as they used to say.
>
> John
>
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