private void createRootStructureElement() {
assert rootStructureElement == null;
PDFParentTree parentTree = logicalStructureHandler.getParentTree();
PDFStructTreeRoot structTreeRoot = pdfFactory.getDocument().makeStructTreeRoot(parentTree);
rootStructureElement = createStructureElement("root", structTreeRoot, null);
structTreeRoot.addKid(rootStructureElement);
}
void setEventBroadcaster(EventBroadcaster eventBroadcaster) {
this.eventBroadcaster = eventBroadcaster;
}