title: Difference between framework and static library in xcode4, and how to call them
body: <p>I am quite new to xcode and objective-c. I want to ask a very basic question.</p>
  
  <p>I saw that when "linking binary to libraries" in project settings, there are differences about framework and libraries, imported from other projects in workspace.</p>
  
  <p>First question, why is there a framework? And why is there a library? Cannot my library be a framework?</p>
  
  <p>And then, from a <em>.h</em> file, how can I call classes from my imported static library?</p>
  
  <p>I suppose there must be a prefix, but I couldn't find it.
  Neither  nor "ProjName/Myclass.h" are working.</p>
  
  <p>Please, be as specific as you can.</p>
  
  <p>Thanks</p>