[R] Write XML according to ggobi DTD

[Jim Rogers]

Hi, 

Has anyone out there written a function to take a data.frame as input
and generate XML that conforms to the DTD for ggobi ("ggobi.dtd")? In
other words, like a simple version of the writeSDML function in the
StatDataML package, but using ggobi.dtd instead of StatDataML.dtd. 

It looks easy to write such a function to handle data.frames with only
numeric data, but a bit of work with character and factor data. 

Thanks,
Jim Rogers