u | Benefits |
| u | latter steps can be performed on preliminary results (e.g. |
| formatters for presentation view) |
| u | using the same filters in multiple process phases |
| u | unique and constant data access path througout the process
| u | improvements in the process do not require new DTD |
| u | only one DTD to manage |
u | Drawbacks |
| u | data model for each |
| process phase must be |
| defined outside of the DTD |
| u | actually no formal method |
| available |