return TimeUtils.getInstance().newDurationYearMonth(str);
return TimeUtils.getInstance().newDurationYearMonth(StringValue.trimWhitespace(str));
	private static Duration createDurationYearMonth(String str) throws XPathException {		try {			return TimeUtils.getInstance().newDurationYearMonth(str);		} catch (IllegalArgumentException e) {			throw new XPathException("FORG0001: cannot construct " + Type.getTypeName(Type.YEAR_MONTH_DURATION) +					" from \"" + str + "\"");            		}	}