case Type.UNTYPED_ATOMIC : return new UntypedAtomicValue(getStringValue());
	public AtomicValue convertTo(int requiredType) throws XPathException {		switch (requiredType) {			case Type.ITEM :			case Type.ATOMIC :			case Type.ANY_URI :				return this;			case Type.STRING :				return new StringValue(uri);			default :				throw new XPathException(					"Type error: cannot cast xs:anyURI to "						+ Type.getTypeName(requiredType));		}	}