programmatically modify x3d.py (https://www.web3d.org/x3d/stylesheets/python/x3d.py) to add containerField output.
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awk script
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modified xslt style sheet to use with X3DUOM (https://www.web3d.org/specifications/X3dUnifiedObjectModel-4.0.xml), for example here: https://martin-honnen.github.io/xslt3fiddle/