XSD Tutorials - Herong's Tutorial Examples - v5.23, by Herong Yang
SAXParser for XSD Validation Fixed
This section describes a tutorial example on how to the Xerces2 SAXParser class included in JDK to perform XSD validation on an XML document. The XSD document must be specified with SAXParser.setProperty() method.
To fix the XSD loading problem in SAXValidator.java, I revised the program using the SAXParser.setProperty() method to set the XSD document explicitly. Here is the revised program, SAXValidatorXsd.java:
/* SAXValidatorXsd.java - Copyright (c) 2002-2013 HerongYang.com. All Rights Reserved. */ import java.io.File; import java.io.IOException; import javax.xml.parsers.SAXParserFactory; import javax.xml.parsers.SAXParser; import javax.xml.parsers.ParserConfigurationException; import org.xml.sax.Attributes; import org.xml.sax.SAXException; import org.xml.sax.SAXParseException; import org.xml.sax.helpers.DefaultHandler; class SAXValidatorXsd { public static void main(String[] args) { String schemaFeature = "http://apache.org/xml/features/validation/schema"; try { File x = new File(args[0]); String schemaLocation = args[1]; SAXParserFactory f = SAXParserFactory.newInstance(); System.out.println(f.toString()); f.setValidating(true); f.setFeature(schemaFeature,true); SAXParser p = f.newSAXParser(); System.out.println(p.toString()); p.setProperty( "http://apache.org/xml/properties/schema" +"/external-noNamespaceSchemaLocation",schemaLocation); p.setProperty( "http://java.sun.com/xml/jaxp/properties/schemaLanguage", "http://www.w3.org/2001/XMLSchema"); DefaultHandler h = new MyErrorHandler(); p.parse(x,h); } catch (ParserConfigurationException e) { System.out.println(e.toString()); } catch (SAXException e) { System.out.println(e.toString()); } catch (IOException e) { System.out.println(e.toString()); } } private static class MyErrorHandler extends DefaultHandler { public void warning(SAXParseException e) throws SAXException { System.out.println("Warning: "); printInfo(e); } public void error(SAXParseException e) throws SAXException { System.out.println("Error: "); printInfo(e); } public void fatalError(SAXParseException e) throws SAXException { System.out.println("Fattal error: "); printInfo(e); } private void printInfo(SAXParseException e) { System.out.println(" Public ID: "+e.getPublicId()); System.out.println(" System ID: "+e.getSystemId()); System.out.println(" Line number: "+e.getLineNumber()); System.out.println(" Column number: "+e.getColumnNumber()); System.out.println(" Message: "+e.getMessage()); } } }
Running it with JDK 1.7 to JDK 13 without Xerces2 JAR files, I get the same result:
herong> java SAXValidatorXsd.java dictionary_invalid_xsd.xml dictionary.xsd com.sun.org.apache.xerces.internal.jaxp.SAXParserFactoryImpl@4387b79e com.sun.org.apache.xerces.internal.jaxp.SAXParserImpl@1ffe63b9 Error: Public ID: null System ID: file:/C:/herong/dictionary_invalid_xsd.xml Line number: 6 Column number: 49 Message: cvc-complex-type.3.2.2: Attribute 'xsi:noNamespaceSchemaLocation' is not allowed to appear in element 'dictionary'. Error: Public ID: null System ID: file:/C:/herong/dictionary_invalid_xsd.xml Line number: 7 Column number: 22 Message: cvc-datatype-valid.1.2.1: 'yes' is not a valid value for 'boolean'. Error: Public ID: null System ID: file:/C:/herong/dictionary_invalid_xsd.xml Line number: 7 Column number: 22 Message: cvc-attribute.3: The value 'yes' of attribute 'acronym' on element 'word' is not valid with respect to its type, 'boolean'. ...
Running it with JDK 13 and with Xerces2 2.12.1 JAR files, I get the same result:
herong> java_xerces SAXValidatorXsd.java dictionary_invalid_xsd.xml dictionary.xsd org.apache.xerces.jaxp.SAXParserFactoryImpl@d4342c2 org.apache.xerces.jaxp.SAXParserImpl@55182842 Error: Public ID: null System ID: file:/Users/herong/write/xsd_20080000/cod/xerces2/dictionary_invalid_xsd.xml Line number: 6 Column number: 49 Message: cvc-complex-type.3.2.2: Attribute 'xsi:noNamespaceSchemaLocation' is not allowed to appear in element 'dictionary'. ...
Interestingly, both implementations in JDK and in Xerces2 JAR files do not like the attribute xsi:noNamespaceSchemaLocation="..." used in the XML document to specify the XSD document. I have no idea why.
Table of Contents
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
JAXP, DOM and SAX APIs in Xerces2 JARs
XML Schema (XSD) Validation using XMLReader
Running XMLReaderValidator on XSD 1.1 Schema
XML Schema (XSD) Validation using SAXParser
►SAXParser for XSD Validation Fixed
SAXParser for XSD 1.1 Validation
Xsd11SchemaValidator.java for XSD 1.1 Validation
Xsd11SchemaValidator.java XSD 1.1 Test Result
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