[Gmsh] Why hole was meshed?

[Orxan Shibliyev]

 NACA0012_spline.geo<https://docs.google.com/file/d/0B96y9s7e-5ZfRVF1MG1mZ09Tb3c/edit>
There is a volume with a hole. When the geometry is 3D meshed, the hole
becomes meshed as well. Basically I have two splines that forms the hole.
When I use lines instead of splines the hole remains unmeshed. Any idea?
(geo file is attached)
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://www.geuz.org/pipermail/gmsh/attachments/20130131/1817bd82/attachment.html>