code: public CollectionComposer<CollectionComposer<PARENT,C>,?> startArray()
      {
          _closeChild();
          CollectionComposer<CollectionComposer<PARENT,C>,?> child = _startCollection(this);
          _collection.add(child._collection);
          return child;
      }
docs: /*
  ********************************************************************
  /* Compose methods, structures
  ********************************************************************