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function createDataset(fields, constraints, sortFields) {
	// Cria o dataset
	var dataset = DatasetBuilder.newDataset();
	dataset.addColumn("Element Name");
	dataset.addColumn("Symbol");
	dataset.addColumn("Atomic Number");
	dataset.addColumn("Atomic Weight");
	// Conecta o servico e busca os livros
	var periodicService = ServiceManager.getService('periodicPeriodicTable');
	var serviceHelper = periodicService.getBean();
	var serviceLocator = periodicService.instantiate('net.webservicex.Periodictable');
	var service = serviceLocator.getPeriodictableSoap();
	// Invoca o serviço
	try {
		var result = service.getAtomicNumber("sodium"); // O termo "sodium" corresponde ao parâmetro do tipo String esperado na assinatura do método getAtomicNumber
		var xml = new XML(result);
		for ( var index in xml.Table) {
			var element = xml.Table[index];
			dataset.addRow(new Array(element.ElementName.toString(), element.Symbol.toString(), element.AtomicWeightAtomicNumber
				.toString(), element.AtomicWeight.toString()));
		}
	} catch (erro) {
		dataset.addRow(new Array(erro));
	}
	return dataset;
}