new to xml

Hi Folks,

I am a molecular biologist that is trying to do data transformation between 
databases using xml for micro-array information. The databases will be both 
relational and object-orientated. I have got some idea on how i would design 
the transfer plan, but i am hoping that i might some more advice here. I 
will be using xml only for data-centric purposes. Do I still need to 
construct a DTD? If so would an xml-schema be better? Will i need to convert 
all xml documents from each database into a common xsl document? What query 
language would be best...assuming some databases are xml-enabled and some 
aren't? Any advice at all would be useful

thanks

Daniel



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