Question

I see in my application that xinclude inside my parsed XML file does not work within my Java XSLT conversion.

However, although I do:

DocumentBuilderFactory factory = DocumentBuilderFactory.newInstance(); factory.setXIncludeAware(true); 

I’m not specifically setting the transformer factory as System.getProperty('javax.xml.transform.TransformerFactory') returns ‘null’.

My question: does the default Java (1.6 or 6) support xinclude or do I have to add an alternative XSLT parser such as Apache Xerces?

Answer 1

According to the spec, support has been there since Java 1.5 (5). I believe XInclude support relies on namespace awareness, which is turned off by default for backwards compatibility reasons.

public class XIncludeDemo {      private static final String XML = '<?xml version=\'1.0\'?>\n'             + '<data xmlns=\'foo\' xmlns:xi=\'http://www.w3.org/2001/XInclude\'>\n'             + '<xi:include href=\'include.txt\' parse=\'text\'/>\n'             + '</data>\n';      private static final String INCLUDE = 'Hello, World!';      public static void main(String[] args) throws Exception {         // data         final InputStream xmlStream = new ByteArrayInputStream(XML                 .getBytes('UTF-8'));         final InputStream includeStream = new ByteArrayInputStream(INCLUDE                 .getBytes('UTF-8'));         // document parser         DocumentBuilderFactory factory = DocumentBuilderFactory.newInstance();         factory.setXIncludeAware(true);         factory.setNamespaceAware(true);         DocumentBuilder docBuilder = factory.newDocumentBuilder();         if (!docBuilder.isXIncludeAware()) {             throw new IllegalStateException();         }         docBuilder.setEntityResolver(new EntityResolver() {             @Override             public InputSource resolveEntity(String publicId, String systemId)                     throws SAXException, IOException {                 if (systemId.endsWith('include.txt')) {                     return new InputSource(includeStream);                 }                 return null;             }         });         Document doc = docBuilder.parse(xmlStream);         // print result         Source source = new DOMSource(doc);         Result result = new StreamResult(System.out);         TransformerFactory transformerFactory = TransformerFactory                 .newInstance();         Transformer transformer = transformerFactory.newTransformer();         transformer.transform(source, result);     }  }