private static final int ELEMENTS_PER_BLOCK = 1000;
@Override
public IOffsetSiteMapEntryIterable[] getDataSources() {
return new IOffsetSiteMapEntryIterable[] { new IOffsetSiteMapEntryIterable() {
public SiteMapIterator getIterator(final int startIndex) {
// todo begin db transaction
return new SiteMapIterator() {