XForms: XML Powered Web Forms

Chapter 5. XForms Model Properties

Introduction

XForms element 〈model〉 holds the instance data along with its associated type constraints. Constraints on XML instance data can be static type constraints as expressed via XML Schema; static constraints are suitable for capturing aspects of the data that are not likely to change during user interaction. Typical examples of such constraints include data type and structural constraints. In addition to holding the instance data, the schema for that instance data, and the submission details, the XForms model can encapsulate additional properties that refine the static schema constraints.

XForms defines a small number of such model properties that can be used to express dynamic constraints. These properties, ...