while (iterator.hasNext()) {
final FObj descendant = iterator.next();
if (descendant instanceof BlockContainer) {
final BlockContainer blockContainer
= (BlockContainer) descendant;
final AbsolutePosition absPosition
= blockContainer.traitAbsolutePosition(null);
if (absPosition.isAbsolutelyPositioned()) {
descendant.throwException("Absolutely-positioned "
+ "block-container may not descend from "
+ "fo:title");
}
}