question: public static Document parse ( Reader reader , boolean validating , boolean namespaceAware , boolean allowDocTypeDeclaration ) throws SAXException , IOException , ParserConfigurationException { DocumentBuilderFactory factory = FactorySupport . createDocumentBuilderFactory ( ) ; factory . setNamespaceAware ( namespaceAware ) ; factory . setValidating ( validating ) ; setQuietly ( factory , XMLConstants . FEATURE_SECURE_PROCESSING , true ) ; setQuietly ( factory , "http://apache.org/xml/features/disallow-doctype-decl" , ! allowDocTypeDeclaration ) ; DocumentBuilder documentBuilder = factory . newDocumentBuilder ( ) ; return documentBuilder . parse ( new InputSource ( reader ) ) ; }
target:  Creates a DocumentBuilder and uses it to parse the XML text read from the given reader, allowing parser validation, namespace awareness and permission of DOCTYPE declarations to be controlled.