Pascal Peter about two years ago wrote a good XML structure for Glscene and posted it in the newsgroup (16/10/2004). It included basic scene editing. I've always thought it would have been great to use his work as a basis for standard glscene file format and a basis for a glscene scene editor.

His site for his editor doesnt have much info:
http://pascal.peter.free.fr/?/3D/Edob3D/

It didnt compile properly because it needed a special component so I changed his code so it didnt use the component. I've got a version with the changes I made at:

http://www.skinhat.com/GLSceneDemos/pascalpeter/edob3dworks.zip