5.11 XForms Model Properties at a Glance

We conclude this chapter with a summary of the various model properties and their role in the overall XForms application in Table 5.2. For each property, we give a brief review of the motivating use cases.

Table 5.2. XForms Model Properties at a Glance

Property	Description
relevant	Model-based switching for conditional interfaces Dynamically reveals appropriate portions of an interface Enables controls based on state-of-instance data
required	Conditionally makes fields required
readonly	Conditionally edit data Dynamic user interaction based on instance values
constraint	Refines static schema constraints Constrains values based on previous user interaction Expresses cardinality constraints on node-sets
calculate	Creates computational dependency among instance nodes Automatically computes fields based on user input Enables spreadsheet-like functionality within XForms
type	Extends schema type definitions Useful when the schema cannot be modified
p3ptype	Holds P3P type information