// to access the counter, that's why a write lock that is valid until commit is needed.
// As this requires locking going through to the store and must thus tunnel caching
// the other part of the fix is a HACK in ExtendedStore
synchronized (HISTORY_LOCK) {
NodeRevisionDescriptors hpathNrds =
content.retrieve( sToken, hpath );
NodeRevisionDescriptor hpathNrd =
content.retrieve( sToken, hpathNrds );
NodeProperty nextHnProp = hpathNrd.getProperty(I_NEXT_HISTORY_NAME,