String ln, boolean isCSS, String s) {
try {
short pcInterp = target.getPercentageInterpretation
(ns, ln, isCSS);
parser.parse(s);
return new AnimatableLengthListValue
(target, producer.getLengthTypeArray(),
producer.getLengthValueArray(),
pcInterp);
} catch (ParseException e) {
// XXX Do something better than returning null.