Hi Damien,
There seems to be very few tools that output PDBML, and Chimera unfortunately is no exception. :-(  It doesn't even seem to be a format that OpenBabel can output.  The only tool that my googling uncovered is 3DNA.  It can apparently write PDBML, though I don't think it can handle non-nucleic acid structures [the documentation for 3DNA leaves a little to be desired so I could be wrong about that limitation].
I hope you get lucky and find something that writes it!

--Eric

                        Eric Pettersen
                        UCSF Computer Graphics Lab
                        http://www.cgl.ucsf.edu

On Jun 23, 2011, at 11:34 PM, Damien LARIVIERE wrote:

Dear all,

WritePDB enables to save a displayed structure in the pdb format.

Is there a way to save the structure into the PDBML format?

If not, do you know a (simple) way to do that?

Many thanks

Damien

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