if (key != null && fProperties.getProperty(key) != null) {
if (fProperties.getProperty(key) != null) {
	private boolean isKeyDefined(String key) {		if (key == null)			return true; // Parse error - don't check key		if (key != null && fProperties.getProperty(key) != null) {			fUsedPropertyNames.add(key);			return true;		}		return false;	}