Importing from other applications
Several different file formats can be understood by OmniGraffle. You can import these files by opening them just as you would open a normal OmniGraffle file.
Microsoft® Visio® XML documents (.vdx) Documents saved by Microsoft® Visio® diagramming software in its XML-based file format can be read by OmniGraffle Pro. This support has been improved since OmniGraffle 3. Note that files in the older, binary Visio® format (.vsd) can't be imported.
DOT files (.dot) OmniGraffle understands a subset of the DOT language used by Graphviz. This isn't a full implementation of DOT, but it can be quite useful.
Diagram! 2 documents (.diagram2 and .dpalette2) Diagram is a NeXTSTEP/OPENSTEP application similar to OmniGraffle. OmniGraffle can import the objects in a Diagram file, but not attached EPS images, sounds, or links.
OmniOutliner documents (.ooutline and .oo3) When you open an OmniOutliner file, the items of the outline are interpreted as a diagram. A dialog appears; use it to indicate exactly how to interpret the outline:
Use the table to assign objects in the diagram style to columns in the outline. If you want to show multiple columns of information for each item, use a diagram style that has grouped objects. You can also assign a column to the objects' notes.
If you are using OmniGraffle Professional, choose whether to put the outline in a completely new document or in a new canvas on the open document.
Xcode projects (.xcode), Project Builder projects (.pbproj), and frameworks (.framework) OmniGraffle uses the Objective-C headers to construct a diagram of the inheritance, protocol, and category relationships.
Interface Builder nib files (.nib) OmniGraffle graphs the connections in the nib file for easy visualization.
EOModeler files (.eomodeld) OmniGraffle creates a diagram of the database relationships described by the file.
Folder structures Drag a folder from the Finder and drop it on OmniGraffle's application icon to map out the folder's contents as a diagram.