Examples of all XvlShell attribute values.
Test X3D DTD experimental extensions mechanisms, the XVL nodes are not legal X3D
Lattice XVL parametric geometry X3D VRML
X3D-Edit 3.3, https://www.web3d.org/x3d/tools/X3D-Edit
"XvlTextSnapshot.jpg" "https://www.web3d.org/x3d/content/examples/Basic/LatticeXvl/XvlTextSnapshot.jpg"