Fλux 

                

                       
                

            

            

                
                
                    
                        
                        
                        
                    
                
                
                
                    
                
                
                    
                    
                        String
                    
                
                
                    
                    
                        mkBook
                    
                
                
                    
                    
                        Element → Maybe Book
                    
                
                
                    
                    
                        []
                    
                
                
                    
                    
                        [Element]
                    
                
                
                
                    
                        
                    
                    
                        
                        
                            Element
                        
                    
                    
                        
                        
                            "book"
                        
                    
                    
                        
                        
                            String
                        
                    
                    
                        
                        
                            findChildren
                        
                    
                    
                        
                        
                            [Element]
                        
                    
                    
                        
                    
                
                
                    
                    
                        Element → [Element]
                    
                
                
                    
                    
                        parseXMLDoc
                    
                
                
                    
                    
                        Maybe Element
                    
                
                
                    
                    
                        maybe
                    
                
                
                    
                    
                        [Element]
                    
                
                
                    
                    
                        map
                    
                
                
                    
                    
                        [Maybe Book]
                    
                
                
                    
                    
                        catMaybes
                    
                
                
                    
                    
                        [Book]