[galaxy-user] Aggregate collections of files (example: Heatmaps)

I am developing several tools that will need to read and write multiple data files at once. For example, Eisen Cluster produces a heatmap which consists of three files: a .cdt file, .atr file and a gtr file which are the underlying heatmap and the array tree and the gene tree. All three files need to be kept together. I guess I could wrap them in a zip file and pack and unpack them. The heatmap is not just a view only object. Some tools, such as cuttree, would extract one tree and then aggregate genes (or arrays) below a certain depth and create a new trio of files. Is there support for (or plans for creating) any aggregate data types? Thanks Ted CBSE, UCSC