XForms example

Hello,

Anybody could send me an example of XForms with a model definition, an instance data, and a user interface. For me it's very important to know how to define the model (with a new data type for example).

Thank you very much for your help

<signature>
  <name>Vaudan Rodrigue</name>
  <organisation>ESIS - HEV's Sierre</organisation>
  <email>rodrigue.vaudan@students.hevs.ch</email>
</signature>