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

[John Carlson]

Finding nodes before or after a node in XSLT.  Google search.

John



On Sat, Mar 28, 2026 at 3:17 AM John Carlson <yottzumm at gmail.com> wrote:

> 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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