[x3d-public] problems with Saxon's xslt3 node module

[John Carlson]

Saxon's xslt3 node.js module has serious issues using X3dToJson.xslt.

For example, an entire ProtoInstance was deleted when converting to
abox.x3d to JSON.  (see attached abox.3d)

Fortunately, their Java Saxon 10.6 HE is our primary stylesheet processor
and is working well.

Here is some pseudocode for running xslt3. You will need some way to
install xslt3, like npm (part of node.js package).

$ npm install -g xslt3
$ xslt3 -xsl:X3dToJson.xslt -s:abox.x3d -o:abox.json

Hmm!

John
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