X3D Resourceshttps://www.web3d.org/x3d/content/examples/X3dResources.html
parent-child node relationships and attribute values, plus full validation ( screenshot ). X3D-XmlSpyProject.spp ( online ) is an overview project for X3D specification-developmen
Lists of numerous resources supporting both X3D Graphics and Virtual Reality Modeling Language (VRML).
That's everything I could find.
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