Need to develop a database schema that associates products and services into industry-standard categories. I know that both the schema and data are out there, yet I'm not finding it.
There are databases that list products (and contain millions of records), but I'm not finding a good database that lists corresponding categories. For example, individual cell phones might be in a "cell phone" category which, in turn might be in the "consumer electronics" category. What would be good sources of these types of categories?