Last modified: 2011-05-05 02:04:51 UTC
There are two classes of imports that occur rather often to justify the ability to import from Commons to en.wikisource.org:
1) Image pages on commons that consist of text often have the full text transcribed there, and retaining the contribution history is useful even though the work is PD. The "Image:" page would be imported to the "Page:" namespace on wikisource
2) PD templates on commons are usually applicable for en.WS as-is or with a little tweaking.
'enwikisource' => array('w', 'OldWikisource', 'b', 'commons'),