what does @property (readonly, retain) mean exactly ?

• Subject: what does @property (readonly, retain) mean exactly ?
• From: Erik Buck <email@hidden>
• Date: Sat, 26 Jan 2008 10:56:05 -0800 (PST)
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Given the following declaration for a non-garbage-collected application:
   
  @property (readonly, retain) NSString *someString;
   
  What does the "retain" mean in this case and is it even legal ?  There won't be a synthesized -(void)setSomeString:(NSString *)aString method because the property is readonly.  Does this cause the synthesis of an accesor like the following?
   
  - (NSString *)someString
  {
     return [[someString retain] autorelease];
  }
   
   
  or does it synthesize 
   
  - (NSString *)someString
  {
     return someString;
  }
   
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