docs: public static SimpleExpressionsPackage init()
    {
      if (isInited) return (SimpleExpressionsPackage)EPackage.Registry.INSTANCE.getEPackage(SimpleExpressionsPackage.eNS_URI);
  
      // Obtain or create and register package
      SimpleExpressionsPackageImpl theSimpleExpressionsPackage = (SimpleExpressionsPackageImpl)(EPackage.Registry.INSTANCE.get(eNS_URI) instanceof SimpleExpressionsPackageImpl ? EPackage.Registry.INSTANCE.get(eNS_URI) : new SimpleExpressionsPackageImpl());
  
      isInited = true;
  
      // Create package meta-data objects
      theSimpleExpressionsPackage.createPackageContents();
  
      // Initialize created meta-data
      theSimpleExpressionsPackage.initializePackageContents();
  
      // Mark meta-data to indicate it can't be changed
      theSimpleExpressionsPackage.freeze();
  
    
      // Update the registry and return the package
      EPackage.Registry.INSTANCE.put(SimpleExpressionsPackage.eNS_URI, theSimpleExpressionsPackage);
      return theSimpleExpressionsPackage;
    }