Standard schema or format for product sheet

Hi all, I'm currently working in a company which sells technical 
products through multiple distribution channels (shop, dealers and 
e-shop) and I'm writing most of the product sheets. I would like to know 
if there is a standard or an existing schema to format a product sheet 
in XML. I have created my own one few years ago but I'm currently using 
DocBook to do that. It works fine but if there is a "universal" and 
wide-used format for product sheet (with schema and XSL/XSL-FO style 
sheets), I will consider to use it instead of DocBook. Thank you for 
your help Vincent