*/
protected void extractData() throws Exception
{
String sQuery = getRequiredProperty("query");
String sScript = getProperty("script.url");
Machine machine = m_context.getMachine();
if (sScript != null)
{
Intrinsic.load(sScript, machine);
}
final Pair spec = (Pair)machine.invoke(new Compiler().compile(
new SchemeParser(machine.getGlobalEnvironment()).parse(new StringReader(sQuery), null),
null, machine, true), (Pair)null);
exportData(new Exporter()
{
public void export(OutputStream ostream) throws Exception