After watching the OmniFocus Field Guide from MacSparky I have been cleaning my OmniFocus database quite seriously. Honest, specially my Contexts were a total mess. Most importantly, I had included some items that are not really tasks but reference material with links that can go somewhere else.
Therefore, I was trying to imagine a way to extract the information without loosing anything and then I found the Export option under File menu.
A project containing several items can be exported as HTML, CSV or simple text. In my case, thinking on the links I had in the Notes area, I exported to HTML. But the results were unexpected since only the title and the context of each task was exported, but not the notes nor the links attached.
The CSV file was not useful either for further treatment of the data, though the links were present.
In the end, only the export to a simple text file did it. I then paste the text to a note in nvAlt and save it. The links are usable and the text can be reformated later to my needs.
Deleting several projects in OmniFocus now...
By the way, if you have not seen the MacSparky field guide, go and buy it right now!