addOption("-select","xpath expression","select BugInstance elements");
		public C2ACommandLine() {			addSwitch("-train", "drop unclassified warnings");			addSwitch("-id", "add unique id attribute (as nominal)");			addSwitch("-ids", "add unique id attribute (as string)");			addSwitch("-idr", "add random unique id attribtue (as nominal)");			addSwitch("-app", "add application name attribute");			addOption("-nominal", "attrName,xpath", "add a nominal attribute");			addOption("-boolean", "attrName,xpath", "add a boolean attribute");			addOption("-numeric", "attrName,xpath", "add a numeric attribute");			addSwitch("-classification", "add bug classification attribute");			addSwitch("-binclass", "add binary (bug/not_bug) classification attribute");			addSwitch("-priority", "add priority attribute");		}