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Client Tier

The design of this client is very clean. It knows nothing at all about the forms it will be required to present. In the middle tier, our PHP program was pretty independent of the data; it asked the database what the fields were and then passed them to the client. It only knew that the UserName and Password existed and had special properties. The UserName is the primary key—the unique identifier of the record. The Password is required to open an exist ing record.

The Flash client is even more ignorant. It does not know any special data elements; it simply displays what it is told to. We create two graphical elements, a simple submit button and a generic data field. The field object can display the contents of an XML leaf element and (optionally) permit it to be edited. It can also recreate itself as XML that reflects the editing and possible validation.


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