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® documents, templates, and stencils (.vsd, .vdx, .vst, .vtx, .vss, .vsx) Documents saved by Microsoft® Visio® diagramming software in its XML-based file format (and now even in its original binary file format! Yeah!) can be read by OmniGraffle Pro. Note that while you can open the binary format, you can't export to it; you'll have to save as an OmniGraffle diagram or export to the XML format. Also note that graphics in the Microsoft® Enhanced Metafile (EMF) format 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.
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.