title: Visual Studio Solution behavior in XCode
body: <p>Is it possible to have multiple projects in one xcode project all accessible for simultaneous development?</p>
  
  <p>Specific situation is to have an application and middleware library under simultaneous development in XCode: all source is accessible for modification (both app's and lib's) but library code is building into library and linking to the app on its own build.</p>
  
  <p>Visual Studio handles it with solution and projects inside, dependencies between them and build order.</p>
  
  <p>What are the steps to get as closer to such behavior as possible?</p>