code: protected void removeAllFromAttributeValueSet() {
  
          final Collection<AbstractHtml5SharedObject> sharedObjects = getSharedObjects();
          boolean listenerInvoked = false;
  
          final Collection<WriteLock> writeLocks = lockAndGetWriteLocks();
          try {
              getAttributeValueSet().clear();
              setModified(true);
  
              invokeValueChangeListeners(sharedObjects);
              listenerInvoked = true;
          } finally {
              for (final Lock lock : writeLocks) {
                  lock.unlock();
              }
          }
          pushQueues(sharedObjects, listenerInvoked);
      }
docs: clears all values from the value set.
  
  @since 1.0.0
  @author WFF