} else if (qName.equals("track")) {
assert elementStack.peek().equals("tracks");
String boneName = SAXUtil.parseString(attribs.getValue("bone"));
Bone bone = nameToBone.get(boneName);
int index = skeleton.getBoneIndex(bone);
track = new BoneTrack(index);
} else if (qName.equals("boneparent")) {
assert elementStack.peek().equals("bonehierarchy");
String boneName = attribs.getValue("bone");
String parentName = attribs.getValue("parent");
Bone bone = nameToBone.get(boneName);