How does a "hypertext reference to the product resource" differ from /product/12345/ or /values/some-long-uuid-here/ ? Giving you the benefit of the doubt that

How does a "hypertext reference to the product resource" differ from /product/12345/ or /values/some-long-uuid-here/ ? Giving you the benefit of the doubt that you'll come up with a good list of differences, it really seems like you're just agreeing with the author.