XML Parser

In one of my projects I needed to process XML files with document type definitions (DTD). The first couple of attempt failed miserably. But after some research I managed to cope:

• Creating a XML document with a document type definition:The following example creates a document which is expected to conform with the XHTML 1.1 standard:

  DocumentBuilder docBuilder = DocumentBuilderFactory.newInstance().newDocumentBuilder();
  DOMImplementation domImpl = docBuilder.getDOMImplementation();
  DocumentType docType = domImpl.createDocumentType("html", "-//W3C//DTD XHTML 1.1//EN", "http://www.w3.org/TR/xhtml11/DTD/xhtml11.dtd");
  Document document = domImpl.createDocument("http://www.w3.org/1999/xhtml", "html", docType);
  

• Writing a XML document with a document type definition:The following example writes the XML document document with a document type definition to standard output:

  DocumentType docType = document.getDoctype();
  Transformer transformer = TransformerFactory.newInstance().newTransformer();
  transformer.setOutputProperty(OutputKeys.DOCTYPE_PUBLIC, docType.getPublicId());
  transformer.setOutputProperty(OutputKeys.DOCTYPE_SYSTEM, docType.getSystemId());
  DOMSource source = new DOMSource(document);
  StreamResult result = new StreamResult(System.out);
  transformer.transform(source, result);
  

See also the XML Validator, the Caching Entity Resolver and the Null Entity Resolver