maintenance: 
  title:        simplified body mass index;; 
  mlmname:      BodyMassIndexSimple;; 
  arden:        Version 2.9;; 
  version:      1.00;; 
  institution:  Medexter Healthcare;; 
  author:       ;; 
  specialist:   ;; 
  date:         2017-05-03;; 
  validation:   testing;; 
library: 
  purpose:      simple body mass index classification;; 
  explanation:  simplified calculation of body mass index;; 
  keywords:     BMI, body mass index;; 
  citations:    ;; 
  links:        en.wikipedia.org/wiki/Body_mass_index;; 
knowledge: 
  type: data_driven;; 
  data:                 
    // parameters are passed as arguments:
	// Age, age in years,
	// Weight, weight in kilograms
	// Height, height in meters
	(age, weight, height) := argument; 
  ;;
  priority:     ;; 
  evoke:        ;; 
  logic:    
    // calculation of BMI 
    result := (weight / (height ** 2));          
     
    // Classification - the classification is only valid for patients older than 19
    if  age is less than 19 years then 
		classification := null;    
    elseif result is less than 18.5 then 
		classification := localized 'under';
    elseif result is less than 25 then 
		classification := localized 'normal';
    else
		classification := localized 'over';        
    endif;

	// construct the localized message
    result_msg := result formatted with localized 'msg' || classification;  
    
	// if there is a classification, execute the action slot
    conclude classification is present;         
  ;; 
  action:   
    return result_msg;       
  ;; 
  urgency:;; 
resources:
  default: en;;
  language: en
    'msg'      : "The patient's BMI %.1f is classified as ";
	'under'    : "Underweight";
	'normal'   : "Normal (healthy weight)";		
    'over'     : "Overweight"
  ;;
end: