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Making the Connection—Binding

The remaining detail is how to associate model item properties with particular instance data nodes. The answer is binding, but it's worth being extra clear with terminology: a bind has two ends, one side in the XForms Model, and the other side at a form control. On the bind element within the XForms Model, the nodeset attribute holds the Model Binding Expression. On the other end, in the user interface, is the UI Binding Expression. This end may be bound two ways, using either IDREFs or XPath.