protected void add(RdfStore store, Statement statement, int numberOfTimes) {
   if (!(statement instanceof CompleteStatement)) {
     throw new IllegalArgumentException("Can only add complete statements ");
   }
   while (numberOfTimes-- > 0) {
     debug("addStatement " + statement);
     store.addStatements((CompleteStatement) statement);
   }
 }
 protected void removeStatements(WildcardStatement statement) {
   store.removeStatements(statement);
 }
 protected void remove(WildcardStatement statement, int numberOfTimes) {
   while (numberOfTimes-- > 0) {
     debug("removeStatement " + statement);
     store.removeStatements(statement);
   }
 }