Save documents as folders, like Pages, Numbers, etc...

What's the right way to go about saving data like Pages, Numbers and other OSX applications do? That is, it looks like a file to the user, but is in fact a directory (a bundle?) containing a variety of stuff. I have some fairly complex data that I'd like to store in the same way; in particular, some sensor data that needs to be associated with video files.

From stackoverflow

• The Apple official docs on the topic are probably a good starting point.

  From the Pages Info.plist file:

  <key>CFBundleDocumentTypes</key>
  <array>
      <dict>
          <key>CFBundleTypeExtensions</key>
          <array>
              <string>pages</string>
          </array>
          [...]
          <key>LSTypeIsPackage</key>
          <true/>
          [...]
      </dict>
  </array>
  

  seem to be what does the trick.

  Dan : Ahh, that's it! A remarkably difficult topic to search upon without knowing what it's called!

• It also looks like NSFileWrapper may be part of the answer: Document-Based Applications Overview FAQ.