private String sourceLastUpdated() {
		XPath xpath = XPathFactory.newInstance().newXPath();
		String updated = "";
		try {
			Document doc = DocumentBuilderFactory.newInstance()
					.newDocumentBuilder()
					.parse("service-names-port-numbers.xml");
			updated = xpath.evaluate("/registry/updated", doc);
		} catch (XPathExpressionException e) {
			logger.log(Level.SEVERE, "Invalid XPath expression!", e);
		} catch (SAXException e) {
			logger.log(Level.SEVERE,
					"Error parsing service-names-port-numbers.xml", e);
		} catch (IOException e) {
			logger.log(Level.SEVERE,
					"Error processing service-names-port-numbers.xml", e);
		} catch (ParserConfigurationException e) {
			logger.log(
					Level.SEVERE,
					"Error creating DocumentBuilder which satisfies the configuration requested.",
					e);
		} finally {
		}
		return updated;
	}