Overriding the Base Datatype - Errors

This section describes a tutorial example on incorrect use of 'xsi:type' when overriding element's base datatype.

If you don't follow those rules mentioned in the previous section when overriding the base datatype of a element with a derived datatype, you will get validation errors. Here is a sample XML document, directory_error.xml, that uses "xsi:type" incorrectly:

<?xml version="1.0"?>
<directory xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance">
<!-- directory_error.xml
 - Copyright (c) 2013, HerongYang.com, All Rights Reserved.

 <!-- error: "phoneContactType" requires "phone" -->
 <contact xsi:type="phoneContactType">
  <name>Herong Yang</name>

 <!-- error: the base datatype takes "name" only -->
  <name>Traffic Hotline</name>

 <!-- error: "webContactType" is not derived from "contactType" -->
 <contact xsi:type="webContactType">
  <name>Search Engine</name>

Here are the validation errors you will get:

>java XsdSchemaValidator directory.xsd directory_error.xml

   Line number: 5
   Column number: 12
   Message: cvc-complex-type.2.4.b: The content of element 
   'contact' is not complete. One of '{phone}' is expected.

   Line number: 8
   Column number: 10
   Message: cvc-complex-type.2.4.d: Invalid content was found 
   starting with element 'phone'. No child element is expected
   at this point.

   Line number: 10
   Column number: 37
   Message: cvc-elt.4.3: Type 'webContactType' is not validly 
   derived from the type definition, 'contactType', of element 

Failed with errors: 3

Last update: 2013.

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

 Overriding Element Type to Empty Content - nillable

 Overriding Element Type to Empty Content - xsi:nil

 Defining a Derived Datatype from a Base Datatype

 Overriding the Base Datatype - xsi:type

Overriding the Base Datatype - Errors

 Linking Multiple Schema Documents Together



 PDF Printing Version