Models from other tools can be imported directly into Poseidon models. This allows for the merging of two or more sub-models into one or the importing of models from different formats. For example, Poseidon can import files stored in MDL format - the file format used by Rational Rose. This feature is available in the Professional, Enterprise, and Embedded Enterprise editions.
To Import Sub-Models:
Main Menu - Select 'Import Files' from the main menu
Keep in mind that importing an XMI file means that no layout, color, or style information is included, as the XMI format simply does not contain this kind of data. You will have to create your own diagrams by dragging elements from the Navigator to the Diagram pane.
To Import XMI Files Created By a Different Tool:
Main Menu - Select 'Open Project', change the file chooser to XMI, then select the XMI file