the xml file in library project isn't exported when I publish my asp.net mvc project to filesystem.

Here is my solution structure.

   ResourcesLibary

        a.xml

   MvcProject

       .......

I've already set the property  "build action" to "Content" and "Copy to Output Directory" to "Copy always.

If I build the solution,the xml file will be copied to bin directory of mvc project and the application can start up.

but every time I publish the project to filesystem, I need copy the xml file to bin directory by hand.