[M4IF Technotes] X3D/XMT compatibility

[Mikael Bourges-Sevenier]

Dear Karin,
hello all,
I'm an austrian student from the college for telecommunication and media. At
present I'm working at my diploma project, which is about authoring
MPEG4-scenes.
I have already made a test-3d scene and exported it to vrml...than I
converted it to x3d..
The next steps would be to make a xmt file out of the x3d file, than to get
bif out of this and than finaly get a mp4 scene...
My present problem is: How can I get from x3d to xmt??
I haven't found any converters and I haven't found any rules how to change
the x3d code by hand (in a text editor) to get to xmt...
I've heard a lot about the interoperability and compatibility between xmt
and x3d... I've read a lot about the compromise and the compact form of
x3d..  someone claimed that it is easy to get from x3d to xmt because of the
compromise form... i've found many statements that there is a high
compatibility between xmt-a and x3d... but nobody is writing about a
practical method to get from x3d to xmt...
Maybe I wrap something...
[Mikael Bourges-Sevenier] 
XMT-A is derived from X3D. However, historically, X3D had 2 DTDs: compromise
and compact. The current X3D specification chose the compact DTD, while
XMT-A chose the compromise DTD.
There exist some XSL translators between both X3D DTDs, I think they are
available on web3d.org. However, they would work only if you use VRML nodes
and, in any case, you would have to edit the files to add object
descriptors. Practically, I didn't find these XSL translators very useful.
Kind regards,
Mike
I would be really glad to hear from someone of you!
Thanks very much in advance!
karin
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