Post-Schema-Validation Infoset
After XML Schema-based validation, it is possible to express an XML document's structure and content in terms of the data model that was implicit during validation. The XML Schema data model includes:
- The vocabulary (element and attribute names)
- The content model (relationships and structure)
- The data types
This collection of information is called the Post-Schema-Validation Infoset (PSVI). The PSVI gives a valid XML document its "type" and facilitates treating the document as an object, using object-oriented programming (OOP) paradigms.
Read more about this topic: XML Schema (W3C)