title: Standard UML file format
body: <p>I have designed UML diagrams in different tools (StarUML, BoUML, Papyrus, Omondo, Rational Rose, etc.) depending on the project and the date (rose was first, after Omondo, then starUMl, ..., now papyrus). However, I see that I cannot open my old UML diagrams because the tool is obsolete.</p>
  
  <p>I would like to know if there is a standard format for UML diagrams. Probably not in production, but at least to know if there is proposal of standard format.</p>
  
  <p>Probably, Eclipse is doing something like that with the M2 project, but do the other tools (not eclipse based) are interested in reading this format.?</p>
  
  <p>Each UML tool uses its own format, but I think the era of proprietary format is over, and open format for diagrams like this should exist.</p>