XML Schema Complete Reference, The

5.3. Introduction to the PSVI

Schema processors do not change any values in the “basic” infoset. Instead, a schema processor provides values for new properties not defined for the basic infoset. An infoset with these additional properties is a PSVI. Chapter 16 describes the additional properties in detail; this section provides only an introduction and a partial description of the more fundamental ones.

By adding additional properties, the PSVI definitions define new classes derived from the old. They are generally known by the same names. PSVI also defines new classes, instances of which are used only as values of PSVI-added properties. For example: There are new classes of information items that mimic all of the schema component classes, so ...