One advantage I see is that now you can do /pets?owner=/people/98765 or /pets?owner=/org/98765 which makes your api more polymorphic. Having said th

One advantage I see is that now you can do /pets?owner=/people/98765 or /pets?owner=/org/98765 which makes your api more polymorphic. Having said that I don't think URL is the right term to describe this. It's more like a <type, id> tuple.