A good source of documentation for the VRML 2.0 specification can be
found in the following way.
Go to http://vrml.sgi.com/develop/ ,
click on "Specifications" on the left hand column, click
on "VRML2.0 - Moving Worlds Spec" on the right hand side of the screen,
and then click on "The VRML 2.0 Specification" link. The information on
nodes is particularly useful.