# org.xml.sax.ext

***

**1. Checking for Lexical Handler Support**

```java
try {
    XMLReader reader = XMLReaderFactory.createXMLReader();
    LexicalHandler handler = reader.getContentHandler();
    handler.startDTD(null, null, null);
} catch (SAXNotSupportedException e) {
    // Lexical handler not supported
}
```

**2. Getting the Lexical Handler**

```java
XMLReader reader = XMLReaderFactory.createXMLReader();
LexicalHandler handler = reader.getContentHandler();
```

**3. Implementing the Lexical Handler Interface**

```java
public class MyLexicalHandler implements LexicalHandler {
    public void startDTD(String name, String publicId, String systemId) { }
    public void endDTD() { }
    public void startEntity(String name) { }
    public void endEntity(String name) { }
    public void startCDATA() { }
    public void endCDATA() { }
    public void comment(char[] ch, int start, int length) { }
}
```

**4. Setting the Lexical Handler**

```java
XMLReader reader = XMLReaderFactory.createXMLReader();
reader.setContentHandler(new MyLexicalHandler());
```

**5. Generating a Lexical Event**

```java
LexicalHandler handler = new MyLexicalHandler();
handler.comment("This is a comment");
```

**6. Using the Lexical Handler with a Parser**

```java
Parser parser = new SAXParserFactory().newSAXParser();
parser.parse("file.xml", new MyLexicalHandler());
```

**7. Detecting Declarative Event**

```java
try {
    XMLReader reader = XMLReaderFactory.createXMLReader();
    DeclHandler handler = reader.getDeclHandler();
    handler.elementDecl(null, null, null, null);
} catch (SAXNotSupportedException e) {
    // Declarative event handler not supported
}
```

**8. Getting the Declarative Event Handler**

```java
XMLReader reader = XMLReaderFactory.createXMLReader();
DeclHandler handler = reader.getDeclHandler();
```

**9. Implementing the DeclHandler Interface**

```java
public class MyDeclHandler implements DeclHandler {
    public void elementDecl(String name, String model) { }
    public void attributeDecl(String eName, String aName,
        String type, String mode, String value) { }
    public void internalEntityDecl(String name, String value) { }
    public void externalEntityDecl(String name, String publicId, String systemId) { }
}
```

**10. Setting the DeclHandler**

```java
XMLReader reader = XMLReaderFactory.createXMLReader();
reader.setDeclHandler(new MyDeclHandler());
```

**11. Generating a Declarative Event**

```java
DeclHandler handler = new MyDeclHandler();
handler.elementDecl("myElement", null);
```

**12. Using the DeclHandler with a Parser**

```java
Parser parser = new SAXParserFactory().newSAXParser();
parser.parse("file.xml", new MyDeclHandler());
```

**13. Locating the Error Handler**

```java
XMLReader reader = XMLReaderFactory.createXMLReader();
ErrorHandler handler = reader.getErrorHandler();
```

**14. Setting the Error Handler**

```java
XMLReader reader = XMLReaderFactory.createXMLReader();
reader.setErrorHandler(new MyErrorHandler());
```

**15. Processing Error**

```java
public class MyErrorHandler implements ErrorHandler {
    public void warning(SAXParseException exception) { }
    public void error(SAXParseException exception) { }
    public void fatalError(SAXParseException exception) { }
}
```

**16. Using Error Handler**

```java
try {
    XMLReader reader = XMLReaderFactory.createXMLReader();
    reader.parse("file.xml");
} catch (SAXException e) {
    ErrorHandler handler = e.getErrorHandler();
    handler.fatalError(e);
}
```

**17. Entity Resolver Implementation**

```java
public class MyEntityResolver implements EntityResolver {
    public InputSource resolveEntity(String publicId, String systemId) { }
}
```

**18. Setting Entity Resolver**

```java
XMLReader reader = XMLReaderFactory.createXMLReader();
reader.setEntityResolver(new MyEntityResolver());
```

**19. Using EntityResolver**

```java
XMLReader reader = XMLReaderFactory.createXMLReader();
reader.parse("file.xml"); // EntityResolver will be used to resolve entities
```

**20. Customizing DTD Validation**

```java
XMLReader reader = XMLReaderFactory.createXMLReader();
reader.setDTDHandler(new MyDTDHandler());
```

**21. Implementing CustomValidationHandler**

```java
public class MyDTDHandler implements DTDHandler {
    public void notationDecl(String name, String publicId, String systemId) { }
    public void unparsedEntityDecl(String name, String publicId, String systemId, String notationName) { }
}
```

**22. Customizing DTD Handler**

```java
XMLReader reader = XMLReaderFactory.createXMLReader();
reader.setDTDHandler(new MyDTDHandler());
```

**23. Implementing DTDHandler**

```java
public class MyDTDHandler implements DTDHandler {
    public void notationDecl(String name, String publicId, String systemId) { }
    public void unparsedEntityDecl(String name, String publicId, String systemId, String notationName) { }
}
```

**24. Using Extended Attributes**

```java
ExtensionHandler handler = reader.getExtensionHandler();
handler.setFeature("http://xml.org/sax/features/use-attributes2", true);
```

**25. Checking for Property Support**

```java
try {
    XMLReader reader = XMLReaderFactory.createXMLReader();
    reader.setFeature("http://xml.org/sax/features/validation", true);
} catch (SAXNotRecognizedException e) {
    // Feature is not recognized
} catch (SAXNotSupportedException e) {
    // Property not supported
}
```

**26. Checking for Feature Support**

```java
try {
    XMLReader reader = XMLReaderFactory.createXMLReader();
    reader.getFeature("http://xml.org/sax/features/validation");
} catch (SAXNotRecognizedException e) {
    // Feature is not recognized
} catch (SAXNotSupportedException e) {
    // Property not supported
}
```

**27. Custom Attributes Implementation**

```java
public class MyExtensionHandler implements ExtensionHandler {
    public Object getExtension(String uri) { }
}
```

**28. Custom Attributes Registration**

```java
XMLReader reader = XMLReaderFactory.createXMLReader();
reader.setProperty("http://xml.org/sax/properties/ext-handler", new MyExtensionHandler());
```

**29. Implementing a PropertyDeclHandler**

```java
public class MyPropertyDeclHandler implements PropertyDeclHandler {
    public void propertyDecl(String name, String value) { }
}
```

**30. Setting a PropertyDeclHandler**

```java
XMLReader reader = XMLReaderFactory.createXMLReader();
reader.setPropertyDeclHandler(new MyPropertyDeclHandler());
```

**31. Checking for PropertyDeclHandler**

```java
try {
    XMLReader reader = XMLReaderFactory.createXMLReader();
    reader.getPropertyDeclHandler();
} catch (SAXNotSupportedException e) {
    // PropertyDeclHandler is not supported
}
```

**32. Determining the Value of a Property**

```java
XMLReader reader = XMLReaderFactory.createXMLReader();
String value = reader.getProperty("http://xml.org/sax/properties/lexical-handler");
```

**33. Setting a Property**

```java
XMLReader reader = XMLReaderFactory.createXMLReader();
reader.setProperty("http://xml.org/sax/properties/lexical-handler", new MyLexicalHandler());
```

**34. Implementation of SAXException**

```java
public class MySAXException extends SAXException {
    public MySAXException(String message) {
        super(message);
    }
}
```

**35. Throwing a Custom Exception**

```java
try {
    // Some code that could throw a SAXException
} catch (SAXException e) {
    if (e instanceof MySAXException) {
        // Handle the custom exception
    }
}
```

**36. Generating a Customized SAXException**

```java
SAXParseException exception = new SAXParseException("My custom exception message", null, null, 1, 1);
throw exception;
```

**37. Using the CharacterDataHandler**

```java
XMLReader reader = XMLReaderFactory.createXMLReader();
reader.setContentHandler(new MyCharacterDataHandler());
```

**38. Implementing the CharacterDataHandler Interface**

```java
public class MyCharacterDataHandler implements ContentHandler {
    public void characters(char[] ch, int start, int length) { }
}
```

**39. Using XMLReader**

```java
XMLReader reader = XMLReaderFactory.createXMLReader();
reader.setContentHandler(new MyContentHandler());
```

**40. Implementing the ContentHandler Interface**

```java
public class MyContentHandler implements ContentHandler {
    public void startDocument() { }
    public void endDocument() { }
    public void startPrefixMapping(String prefix, String uri) { }
    public void endPrefixMapping(String prefix) { }
    public void startElement(String uri, String localName, String qName, Attributes atts) { }
    public void endElement(String uri, String localName, String qName) { }
    public void characters(char[] ch, int start, int length) { }
    public void ignorableWhitespace(char[] ch, int start, int length) { }
    public void processingInstruction(String target, String data) { }
    public void skippedEntity(String name) { }
}
```

**41. Using XMLFilter**

```java
XMLReader reader = XMLReaderFactory.createXMLReader();
XMLFilter filter = new MyXMLFilter();
reader.setContentHandler(filter);
filter.setContentHandler(new MyContentHandler());
```

**42. Implementing the XMLFilter Interface**

```java
public class MyXMLFilter implements XMLFilter {
    public XMLReader getParent() { }
    public void setParent(XMLReader parent) { }
    public ContentHandler getContentHandler() { }
    public void setContentHandler(ContentHandler handler) { }
    public EntityResolver getEntityResolver() { }
    public void setEntityResolver(EntityResolver resolver) { }
    public ErrorHandler getErrorHandler() { }
    public void setErrorHandler(ErrorHandler handler) { }
    public DTDHandler getDTDHandler() { }
    public void setDTDHandler(DTDHandler handler) { }
    public ContentHandler startDocument() { }
    public ContentHandler endDocument() { }
    public ContentHandler startPrefixMapping(String prefix, String uri) { }
    public ContentHandler endPrefixMapping(String prefix) { }
    public ContentHandler startElement(String uri, String localName, String qName, Attributes atts) { }
    public ContentHandler endElement(String uri, String localName, String qName) { }
    public ContentHandler characters(char[] ch, int start, int length) { }
    public ContentHandler ignorableWhitespace(char[] ch, int start, int length) { }
    public ContentHandler processingInstruction(String target, String data) { }
    public ContentHandler skippedEntity(String name) { }
}
```

**43. Generating Synthetic SAX**

```java
XMLFilter filter = new MyXMLFilter();
filter.setParent(XMLReaderFactory.createXMLReader());
```

**44. Using the DeclHandler2**

```java
XMLReader reader = XMLReaderFactory.createXMLReader();
reader.setDeclHandler(new MyDeclHandler2());
```

**45. Implementing the DeclHandler2 Interface**

```java
public class MyDeclHandler2 implements DeclHandler2 {
    public void elementDecl(String name, String model) { }
    public void attributeDecl(String eName, String aName,
        String type, String mode, String value, boolean cdata) { }
    public void internalEntityDecl(String name, String value) { }
    public void externalEntityDecl(String name, String publicId, String systemId) { }
}
```

**46. Using the DTDHandler2**

```java
XMLReader reader = XMLReaderFactory.createXMLReader();
reader.setDTDHandler(new MyDTDHandler2());
```

**47. Implementing DTDHandler2**

```java
public class MyDTDHandler2 implements DTDHandler2 {
    public void notationDecl(String name, String publicId, String systemId) { }
    public void unparsedEntityDecl(String name, String publicId, String systemId, String notationName) { }
}
```

**48. Implementing ErrorHandler2**

```java
public class MyErrorHandler2 implements ErrorHandler2 {
    public void warning(SAXParseException exception) { }
    public void error(SAXParseException exception) { }
    public void fatalError(SAXParseException exception) { }
    public void getLocalizedMessage(SAXParseException exception) { }
}
```

**49. Implementing EntityResolver2**

```java
public class MyEntityResolver2 implements EntityResolver2 {
    public InputSource resolveEntity(String publicId, String systemId) { }
    public InputSource resolveEntity(String name, String baseURI, String systemId) { }
}
```

**50. Implementing LexicalHandler2**

```java
public class MyLexicalHandler2 implements LexicalHandler2 {
    public void startDTD(String name, String publicId, String systemId) { }
    public void endDTD() { }
    public void startEntity(String name) { }
    public void endEntity(String name) { }
    public void startCDATA() { }
    public void endCDATA() { }
    public void comment(char[] ch, int start, int length) { }
    public void startDTD(String name, String publicId, String systemId, String baseURI) { }
    public void endDTD(String name) { }
    public void startEntity(String name, String baseURI) { }
    public void endEntity(String name, String baseURI) { }
}

```