You can get a bit more mileage from having separate lists and instances of your widgets.
There is nothing that says you must organise resources hierarchically, although many people prefer to do so. There are advantages to separating your containment hierarchies from your components. It makes it trivial to add new containers and the containers can accept search parameters.
You could organise your URIs like this:
- The second widget
- A form describing how to create a widget
- The list of the first N (say N=25) widgets
- The list of the next N widgets starting at 26
Then consider a sequence of hypertext style actions:
- Retrieve a list of widgets
- Retrieve details of the second one
- Replace some of the details
- Retrieve a form (resource parameter decription)
- or whatever you want to call it, for creating widgets
- Create a new widget
POST http://example.org/widget <= LOCATION: //example.org/widget/123
- Get the new widget
- Delete the Widget
This organisation is similar to that of the rest-discuss html interface. But you cannot use PUT, POST and DELETE in that interface.
Using the http://example.org/widget URI for creating new widgets is similar to the Prototype design pattern while still adhering to the expected behaviour of a POST, ie. create a subordinate resource.