%BOOK_ENTITIES;
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    Interfaces
    
      The protocol includes several interfaces which are used for
      interacting with the server.  Each interface provides requests,
      events, and errors (which are really just special events) as described
      above.  Specific compositor implementations may have their own
      interfaces provided as extensions, but there are several which are
      always expected to be present.
    
    
    Core interfaces:
    
    
    
    
  
    protocol-summary--
    
    
      
      
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