#VRML[3] VRML 1.0C Specification, https://www.paulbourke.net/dataformats/vrml1/#General%20Syntax
[2] VRML97, ISO/IEC 14772-1:1997 -- 4 Concepts, , https://www.web3d.org/documents/specifications/14772/V2.0/part1/concepts.html#4.2.2
[4] VRML, ISO/IEC 14772-3:200x -- 4 Concepts, https://www.cs.auckland.ac.nz/references/vrml/x3d/part5/concepts.html#4.2.2
#X3D[1] ISO/IEC 19776-2:2015 — Classic VRML encoding — 4 Concepts, , https://www.web3d.org/documents/specifications/19776-2/V3.3/Part02/concepts.html#HeaderStatementSyntax