if ( !file.exists () ) throw new Exception("Error: schema file not found !");
InputStream istrm = new FileInputStream ( file );
InputSource is = new InputSource ( istrm );
SchemaFactory schf = SchemaFactory.lookup( SchemaFactory.NAMESPACE_SCHEMATRON );
Schema sch = schf.compileSchema( is );
Validator validator = sch.newValidator();
// set preprocessor parameters
if (args.length > 1)
validator.setProperty("phase", new String(args[1]));