XSD Tutorials - Herong's Tutorial Examples - v5.23, by Herong Yang
Standard Steps to Validate XML Documents Against a Schema
This section describes the standard steps of loading an XML schema file and use it to validate XML documents.
If you want to use the JAXP included in JDK to validate XML documents against XML schema files, you need to follow the standard steps described below:
1. Create a SchemaFactory instance by selecting the default implementation of the XML Schema language. For example, sfactory = SchemaFactory.newInstance(W3C_XML_SCHEMA_NS_URI). W3C_XML_SCHEMA_NS_URI is pre-defined constant of "http://www.w3.org/2001/XMLSchema", the fully-qualified URI for W3C XML Schema language.
2. The SchemaFactory instance can then be used to read a schema file, parse it, and create a Schema instance. for example, schema = sfactory.newSchema(new File(name)). The newSchema() method will throw exceptions, if there are any errors while parsing the specified schema file.
3. When the Schema instance is loaded from the XSD file, it can be used to create a Validator instance. The Validator instance is now ready to be used to validate any XML files presented as a DOMSource, SAXSource or other XML sources. For example, validator = schema.newValidator().
4a. One way to feed the XML file to the Validator instance is to present it as a DOMSource object. This can be done in 4 steps:
4b. Another way to feed the XML file to the Validator instance is to present it as a SAXSource object. This can be done in 3 steps:
5. With the XSD file parsed and represented as a Validator instance, and the XML file represented as a Source object, validating the XML file can be done by calling the validate() method. For example, validator.validate(source).
Several tutorial examples will be provided in this chapter to show you how to perform different steps mentioned above.
Table of Contents
XML Editor and Schema Processor - XMLPad
Java API for XML Processing - JAXP
►JAXP - XML Schema (XSD) Validation
►Standard Steps to Validate XML Documents Against a Schema
XSD Schema File Loader - XsdSchemaLoader.java
XSD Schema File Loading Errors
XSD Schema XML DOM Validator - XsdSchemaDomValidator.java
XSD Schema XML DOM Validation Errors
XSD Schema XML DOM Validator with Error Handler
XSD Schema XML SAX Validator - XsdSchemaSaxValidator.java
XSD Schema XML SAX Validation Errors
XSD Schema XML SAX Validator with Error Handler
XSD Schema XML Validator - Final Version
XSD 1.1 Not Supported in JDK 13
Xerces2 Java Parser - Java API of XML Parsers
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
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