Bug 154423 Stack overflow using XML data source
data/org.eclipse.birt.report.data.oda.xml/src/org/eclipse/birt/report/data/oda/xml/util/ui/SchemaPopulationUtil.java
* 
	 * @param fileName
	 * @return
	 * @throws OdaException
	 * @throws MalformedURLException 
	 * @throws URISyntaxException 
	 */
	public static ATreeNode getSchemaTree( String fileName, boolean incAttr )
			throws OdaException, MalformedURLException, URISyntaxException
	{
		includeAttribute = incAttr;
		DocumentBuilderFactory factory = DocumentBuilderFactory.newInstance( );
		factory.setNamespaceAware( true );
		URI uri = null;
		File f = new File(fileName);
		if( f.exists( ))
			uri = f.toURI();
		else
		{
			URL url = new URL(fileName);
			uri = new URI(url.getProtocol( ), url.getUserInfo( ), url.getHost( ), url.getPort( ), url.getPath( ), url.getQuery( ), url.getRef( ));
		}
		
		
		if ( uri == null )
		{
			uri = new URI( fileName );
		}
		
		XSLoader xsLoader = new XMLSchemaLoader( );