XSD Tutorials - Herong's Tutorial Examples - Version 5.10, by Dr. Herong Yang

Assertion as Custom Validation Rules

This chapter provides notes and tutorial examples on assertion validation rules. Topics include introduction of 'assert' validation rules for 'complexType' datatypes; 'assertion' validation rules for 'simpleType' datatypes; XPath expressions; $value representing current node value.

What Is an Assertion?

Assertion as the Forth Level Constraints

"assert" Statements for "complexType" Datatype

"assertion" Statements for "simpleType" Datatype

Conclusion:

  • Assertions are introduced in XSD 1.1 to allow you to specify any validation rules that you can specify in XPath expressions.
  • "assert" statements are used to declare assertions for "complexType" custom defined datatypes.
  • "assertion" statements are used to declare assertions for "simpleType" custom defined datatypes.
  • "$value" is used in XPath expression to represent the current node value.

Table of Contents

 About This Book

 Introduction to XML Schema

 XML Editor and Schema Processor - XMLPad

 Java API for XML Processing - JAXP

 JAXP - XML Schema (XSD) Validation

 Xerces2 Java Parser - Java API of XML Parsers

 Using Xerces2 Java API

 XML Schema Language - Basics

 Introduction of XSD Built-in Datatypes

 "string" and Its Derived Datatypes

 "decimal" and Its Derived Datatypes

 "dateTime" and Its Related Datatypes

 Miscellaneous Built-in Datatypes

 Facets, Constraining Facets and Restriction Datatypes

 "simpleType" - Defining Your Own Simple Datatypes

 Complex Element Declaration

 Identity-Constraints: unique, key and keyref

Assertion as Custom Validation Rules

 XML Schema Location and Namespace in XML Documents

 Overriding Element Types in XML Documents

 Linking Multiple Schema Documents Together

 Glossary

 References

 PDF Printing Version

Assertion as Custom Validation Rules - Updated in 2014, by Dr. Herong Yang