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

[John Carlson]

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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