When building an xml file to supply to Google Shopping product taxonomy is required for: Apparel & Accessories > Clothing (1604) Apparel & Accessories > Shoes (187) Apparel & Accessories > Clothing Accessories > Sunglasses (178) Apparel & Accessories > Handbags, Wallets & Cases > Handbags (3032) Apparel & Accessories > Jewelry > Watches (201) Media > Books (784) Media > DVDs & Videos (839) Media > Music & Sound Recordings (855) Software > Video Game Software (1279) (includes computer games)For products in these categories, you can't just provide the highest-level category, like Apparel & Accessories (166) or Media (783).These categories are optional for products in all other categories.Link to the current Google shopping product category taxonomy:https://www.google.com/basepages/producttype/taxonomy.en-US.txt