// URI scheme : http://en.wikipedia.org/wiki/URI_scheme
//
//  foo://username:password@example.com:8042/over/there/index.dtb?type=animal&name=narwhal#nose
//  \_/   \_______________/ \_________/ \__/            \___/ \_/ \______________________/ \__/
//   |           |               |       |                |    |            |                |
//   |       userinfo           host    port              |    |          query          fragment
//   |    \________________________________/\_____________|____|/ \__/        \__/
// schema                 |                          |    |    |    |          |
//                    authority                      |    |    |    |          |
//                                                 path   |    |    interpretable as keys
//                                                        |    |
//        \_______________________________________________|____|/       \____/     \_____/
//                             |                          |    |          |           |
//                     hierarchical part                  |    |    interpretable as values
//                                                        |    |
//                                   interpretable as filename |
//                                                             |
//                                                             |
//                                               interpretable as extension