code: public void addDocument(LREnvelope envelope) throws LRException
      {
          if(!configured)
          {
              throw new LRException(LRException.NOT_CONFIGURED);
          }
          
          docs.add(envelope.getSendableData());
      }
docs: Adds an envelope to the exporter
  
  @param envelope envelope to add to the exporter
  @throws LRException NOT_CONFIGURED