final DocumentTableModel model = getDataModel();
if(_id == BLOCKS_PER_NODE) {
return model.createNode(NodeKind.DOCUMENT, 0);
}
final IDocumentTable store = documentTable();
final long pid = store.parent(_id);
if(pid == 0L) {
return null;
}
return model.createNode(store.getNodeKindAt(pid), pid);
}