Trying to figure out how is product data/metadata schema designed. For example, how does an e-commerce site enter a product spec. Does it copy and paste from mfg spec sheet, enters it in their own fields or something else? Here is an example, looking at the D3000 Nikon DSLR
Manufacturer: http://nikon.ca/en/Product.aspx?m=17300&disp=Specs
futureshop.ca: www.futureshop.ca/en-CA/product/nikon-nikon-d3000-10-2mp-dslr-camera-with-18-55mm-lens-kit-d3000/10128435.aspx?path=865c2348a1542e848982c9dbd9253483en02
memoryexpress.com: www.memoryexpress.com/Products/PID-MX25539%28ME%29.aspx
They are all slightly different in order or in parent/child field? What's storage is used for this type of info rdbms or xml?