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?


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