XForms options are required when you are creating an XFDL form that contains an XForms data model. XForms options link the XFDL items on the form to the XForms data model, so that the items and model share data.
XForms options belong to the XForms namespace. However, in most respects these options are treated just like XFDL options. They are added to the syntax of the form at the same level, set particular characteristics for the containing item, and are recognized by the XFDL parser.
Despite this, XForms options do have some features that differ from XFDL options. This chapter describes these features and then details each of the XForms options separately.