currentobj = datasource;
} else if (localName.equals("sparql")) {
datasource = new SparqlDataSource();
currentobj = datasource;
} else if (localName.equals("ntriples")) {
datasource = new NTriplesDataSource();
currentobj = datasource;
} else if (localName.equals("data-source")) {
datasource = (DataSource) instantiate(attributes.getValue("class"));
currentobj = datasource;
} else if (localName.equals("column")) {