"Extensible 3D (X3D) is a trademark of the Web3D Consortium (www.web3d.org) and is the next generation of VRML (Virtual Reality Modelling Language). The Web3D Consortium [2004] defines X3D as “a software standard for defining interactive web and broadcast-based 3D content integrated with multimedia”. X3D allows users to download, display and interact with 3D content via a web browser plug-in or standalone viewer." (text from 2005 Web3D: X3D-UML: enabling advanced UML visualisation through X3D)