Repeating nested structures

I am trying to access how I would implement the following use case using
XForms. I would appreciate if the group can give me some direction on it.

My application uses a nested data structure shown below:

    class Assembly {
        Collection parts;
    }

    class Part {
        int partNumber;
        String partName;
        PhysicalProperties pp;
        ChemicalProperties cp;
    }

    class PhysicalProperties {
        ...
    }

    class ChemicalProperties {
        ...
    }

1) I would like to show an assembly using a table of parts. Each row in the
table represents a part and always shows the partNumber and its name. The
PhysicalProperties and ChemicalProperties are shown in two tabs within the
same table (or two tabs in a different table that is aligned and
synchronized with the first table). The idea is that the basic properties
(partNumber and partName) are always shown, but only one of the two other
property groups, PhysicalProperties or ChemicalProperties, is visible at any
one time depending on the tab selected by the user. Can this behavior be
represented using XForms?

2) When entering or displaying an assembly, if any part breaks business
rules, the entire row representing that part should be colored red. How can
this behavior be achieved using XForms?

I have read the spec, but I do not yet completely understand concepts such
as repeat and events.
Thanks.

Naresh Bhatia
Sapient
One Memorial Drive, Cambridge, MA 02142
Tel: 617-761-1771  Fax: 617-621-1300
Email: nbhatia@sapient.com