Stephen, I am very excited to learn of your interest in creating XForms based forms for UBL. In my work with the US DOT we are pursuing a proof concept demonstration that hopes to use UBL as the basis for freight transport status messages. These status messages would be issued at selected points in the supply chain to assist in the tracking of intermodal freight on an international supply chain route. During some early and general definition of the work I formulated the following useage:

9. Developing input forms In order to reduce redundant data entry along the supply chain, users will require input forms that can be pre-populated with information previously entered upstream. Input forms may also be required for any query of the system.

(This section offers guidelines for developing input forms for the project through the use of XForms. "XForms is an XML format for the specification of user interfaces, specifically web forms. XForms was designed to be the next generation of HTML / XHTML forms, but is generic enough that it can also be used in a standalone manner to describe any user interface, and even perform simple and common data manipulation tasks." )

Needless to say, this was a first thought and would need to be refined to formulate more explicit requirements. I welcome any opportunity to collaborate.